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Claire Brown

Random Question

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I’ll apologize in advance for the non-microscopy question but I thought someone on the list might be able to answer. Does anyone know why the sunsets in Australia are violet?

Linda Barthel

Re: Random Question

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Because it is opposite of yellow on the color wheel...
Linda

On Mon, Aug 19, 2019 at 7:36 PM Claire Brown <[hidden email]> wrote:
>
> *****
> To join, leave or search the confocal microscopy listserv, go to:
> http://lists.umn.edu/cgi-bin/wa?A0=confocalmicroscopy
> Post images on http://www.imgur.com and include the link in your posting.
> *****
>
> I’ll apologize in advance for the non-microscopy question but I thought someone on the list might be able to answer. Does anyone know why the sunsets in Australia are violet?

Loralei Dewe-3

Re: Random Question

> *****
> To join, leave or search the confocal microscopy listserv, go to:
> http://lists.umn.edu/cgi-bin/wa?A0=confocalmicroscopy
> Post images on http://www.imgur.com and include the link in your posting.
> *****
>
> Because it is opposite of yellow on the color wheel...
> Linda
>
>
>
>
>
> On Mon, Aug 19, 2019 at 7:36 PM Claire Brown <[hidden email]>
> wrote:
> >
> > *****
> > To join, leave or search the confocal microscopy listserv, go to:
> > http://lists.umn.edu/cgi-bin/wa?A0=confocalmicroscopy
> > Post images on http://www.imgur.com and include the link in your
> posting.
> > *****
> >
> > I’ll apologize in advance for the non-microscopy question but I thought
> someone on the list might be able to answer. Does anyone know why the
> sunsets in Australia are violet?
>

Loralei Dewe-3

Re: Random Question

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Well that was supposed to be it makes no sense to me..

Loralei

On Mon, Aug 19, 2019, 4:57 PM Loralei Dewe <[hidden email]> wrote:

> Makes no
>
> On Mon, Aug 19, 2019, 4:47 PM Linda Barthel <[hidden email]> wrote:
>
>> *****
>> To join, leave or search the confocal microscopy listserv, go to:
>> http://lists.umn.edu/cgi-bin/wa?A0=confocalmicroscopy
>> Post images on http://www.imgur.com and include the link in your posting.
>> *****
>>
>> Because it is opposite of yellow on the color wheel...
>> Linda
>>
>>
>>
>>
>>
>> On Mon, Aug 19, 2019 at 7:36 PM Claire Brown <[hidden email]>
>> wrote:
>> >
>> > *****
>> > To join, leave or search the confocal microscopy listserv, go to:
>> > http://lists.umn.edu/cgi-bin/wa?A0=confocalmicroscopy
>> > Post images on http://www.imgur.com and include the link in your
>> posting.
>> > *****
>> >
>> > I’ll apologize in advance for the non-microscopy question but I thought
>> someone on the list might be able to answer. Does anyone know why the
>> sunsets in Australia are violet?
>>
>

Ho-chun LAI

Re: Random Question

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Not even the question makes any sense to me. I know Australia is a weird place but what kind of looney land have a violet sunset?

John
________________________________
From: Confocal Microscopy List <[hidden email]> on behalf of Loralei Dewe <[hidden email]>
Sent: Tuesday, August 20, 2019 8:02:37 AM
To: [hidden email] <[hidden email]>
Subject: Re: Random Question

*****
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Well that was supposed to be it makes no sense to me..

Loralei

On Mon, Aug 19, 2019, 4:57 PM Loralei Dewe <[hidden email]> wrote:

mmodel

Re: Random Question

In reply to this post by Loralei Dewe-3

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Dust from the deserts?

________________________________
From: Confocal Microscopy List <[hidden email]> on behalf of Loralei Dewe <[hidden email]>
Sent: Monday, August 19, 2019 8:02 PM
To: [hidden email] <[hidden email]>
Subject: Re: Random Question

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Well that was supposed to be it makes no sense to me..

Loralei

On Mon, Aug 19, 2019, 4:57 PM Loralei Dewe <[hidden email]> wrote:

Douglas Richardson

Re: Random Question

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The sun is still high enough that light (rays) travelling from the sun
towards the upper atmosphere are scatted (bent) towards your eye. At the
same time, the sun is low enough that blue (and green) light travelling
directly from the sun towards your eye is scattered before reaching your
eye. Therefore only the red remains. You see Blue + Red = Magenta.

No idea why this is more evident in Australia, but probably due to the
angle relative to the sun at such a low latitude.

-Doug

On Mon, Aug 19, 2019 at 8:19 PM MODEL, MICHAEL <[hidden email]> wrote:

> *****
> To join, leave or search the confocal microscopy listserv, go to:
> http://lists.umn.edu/cgi-bin/wa?A0=confocalmicroscopy
> Post images on http://www.imgur.com and include the link in your posting.
> *****
>
> Dust from the deserts?
>
> ________________________________
> From: Confocal Microscopy List <[hidden email]> on
> behalf of Loralei Dewe <[hidden email]>
> Sent: Monday, August 19, 2019 8:02 PM
> To: [hidden email] <[hidden email]>
> Subject: Re: Random Question
>
> *****
> To join, leave or search the confocal microscopy listserv, go to:
> http://lists.umn.edu/cgi-bin/wa?A0=confocalmicroscopy
> Post images on http://www.imgur.com and include the link in your posting.
> *****
>
> Well that was supposed to be it makes no sense to me..
>
> Loralei
>
> On Mon, Aug 19, 2019, 4:57 PM Loralei Dewe <[hidden email]> wrote:
>
> > Makes no
> >
> > On Mon, Aug 19, 2019, 4:47 PM Linda Barthel <[hidden email]> wrote:
> >
> >> *****
> >> To join, leave or search the confocal microscopy listserv, go to:
> >> http://lists.umn.edu/cgi-bin/wa?A0=confocalmicroscopy
> >> Post images on http://www.imgur.com and include the link in your
> posting.
> >> *****
> >>
> >> Because it is opposite of yellow on the color wheel...
> >> Linda
> >>
> >>
> >>
> >>
> >>
> >> On Mon, Aug 19, 2019 at 7:36 PM Claire Brown <[hidden email]>
> >> wrote:
> >> >
> >> > *****
> >> > To join, leave or search the confocal microscopy listserv, go to:
> >> > http://lists.umn.edu/cgi-bin/wa?A0=confocalmicroscopy
> >> > Post images on http://www.imgur.com and include the link in your
> >> posting.
> >> > *****
> >> >
> >> > I’ll apologize in advance for the non-microscopy question but I
> thought
> >> someone on the list might be able to answer. Does anyone know why the
> >> sunsets in Australia are violet?
> >>
> >
>

Linda Barthel

Re: Random Question

In reply to this post by Claire Brown

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*****

Because on the color wheel violet is direct opposite of yellow...
Yellow sunsets in the northern hemisphere, violet sunsets in the
southern hemisphere...
Linda

On Mon, Aug 19, 2019 at 7:36 PM Claire Brown <[hidden email]> wrote:
>
> *****
> To join, leave or search the confocal microscopy listserv, go to:
> http://lists.umn.edu/cgi-bin/wa?A0=confocalmicroscopy
> Post images on http://www.imgur.com and include the link in your posting.
> *****
>
> I’ll apologize in advance for the non-microscopy question but I thought someone on the list might be able to answer. Does anyone know why the sunsets in Australia are violet?

Benjamin Smith

Re: Random Question

*****
To join, leave or search the confocal microscopy listserv, go to:
http://lists.umn.edu/cgi-bin/wa?A0=confocalmicroscopy
Post images on http://www.imgur.com and include the link in your posting.
*****

Along the lines of what Doug said, the upper atmosphere can be blue while
dust or smoke in the troposphere can increase the amount of red. If they
balance out you get pink. In the Midwest this would often happen during
planting or harvest due to the extra agricultural dust in the air (made for
amazing sunrises and sunsets). According to this (
https://ipad.fas.usda.gov/rssiws/al/crop_calendar/as.aspx), Australia is
right in between planting and harvest, so it is unlikely to be
agricultural. Australia is however prone to dust storms, so if a low
pressure front kicked up some dust from the outback, that could also cause
a violet sunset. If the area you are in is generally flat, this will also
cause more pronounced sunsets.

-Ben Smith

On Mon, Aug 19, 2019 at 5:57 PM Linda Barthel <[hidden email]> wrote:

> *****
> To join, leave or search the confocal microscopy listserv, go to:
> http://lists.umn.edu/cgi-bin/wa?A0=confocalmicroscopy
> Post images on http://www.imgur.com and include the link in your posting.
> *****
>
> Because on the color wheel violet is direct opposite of yellow...
> Yellow sunsets in the northern hemisphere, violet sunsets in the
> southern hemisphere...
> Linda
>
>
>
>
> On Mon, Aug 19, 2019 at 7:36 PM Claire Brown <[hidden email]>
> wrote:
> >
> > *****
> > To join, leave or search the confocal microscopy listserv, go to:
> > http://lists.umn.edu/cgi-bin/wa?A0=confocalmicroscopy
> > Post images on http://www.imgur.com and include the link in your
> posting.
> > *****
> >
> > I’ll apologize in advance for the non-microscopy question but I thought
> someone on the list might be able to answer. Does anyone know why the
> sunsets in Australia are violet?
>

Cammer, Michael

Re: Random Question

*****
To join, leave or search the confocal microscopy listserv, go to:
http://lists.umn.edu/cgi-bin/wa?A0=confocalmicroscopy
Post images on http://www.imgur.com and include the link in your posting.
*****

I just scrolled through a few hundred sunset pictures from a Google search for "sunsets australia" and don’t see how they are different from sunsets (or pics of sunsets) from north of the equator or other parts of the world. Perhaps the answer lies in the particular locations, times, and perceptions of sunsets to which you refer in contrast to others.
When people come to me with image analysis issues or reporting phenomena from samples or instrumentation, I usually need to see pictures, preferably raw data with the metadata intact.
Cheers-
Michael C.

-----Original Message-----
From: Confocal Microscopy List <[hidden email]> On Behalf Of Benjamin Smith
Sent: Monday, August 19, 2019 11:26 PM
To: [hidden email]
Subject: Re: Random Question

*****
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Post images on https://urldefense.proofpoint.com/v2/url?u=http-3A__www.imgur.com&d=DwIFaQ&c=j5oPpO0eBH1iio48DtsedeElZfc04rx3ExJHeIIZuCs&r=E0xNnPAQpUbDiPlC50tp7rW2nBkvV7fujQf0RknE5bU&m=_7XC3mQ36QrHUHiA_f9ivQG7Gv3A5CCo7hzqnwzDiUg&s=9DQPN2av9zX1qTkgbokyyvVjZpyls1PWwtF4kVdFiU8&e= and include the link in your posting.
*****

Along the lines of what Doug said, the upper atmosphere can be blue while dust or smoke in the troposphere can increase the amount of red. If they balance out you get pink. In the Midwest this would often happen during planting or harvest due to the extra agricultural dust in the air (made for amazing sunrises and sunsets). According to this ( https://urldefense.proofpoint.com/v2/url?u=https-3A__ipad.fas.usda.gov_rssiws_al_crop-5Fcalendar_as.aspx&d=DwIFaQ&c=j5oPpO0eBH1iio48DtsedeElZfc04rx3ExJHeIIZuCs&r=E0xNnPAQpUbDiPlC50tp7rW2nBkvV7fujQf0RknE5bU&m=_7XC3mQ36QrHUHiA_f9ivQG7Gv3A5CCo7hzqnwzDiUg&s=hUxAnDBngI9mVIWeAHHaT7xQ88srySkSbQw6Xru1qCo&e= ), Australia is right in between planting and harvest, so it is unlikely to be agricultural. Australia is however prone to dust storms, so if a low pressure front kicked up some dust from the outback, that could also cause a violet sunset. If the area you are in is generally flat, this will also cause more pronounced sunsets.

-Ben Smith

On Mon, Aug 19, 2019 at 5:57 PM Linda Barthel <[hidden email]> wrote:

> *****
> To join, leave or search the confocal microscopy listserv, go to:
> https://urldefense.proofpoint.com/v2/url?u=http-3A__lists.umn.edu_cgi-
> 2Dbin_wa-3FA0-3Dconfocalmicroscopy&d=DwIFaQ&c=j5oPpO0eBH1iio48DtsedeEl
> Zfc04rx3ExJHeIIZuCs&r=E0xNnPAQpUbDiPlC50tp7rW2nBkvV7fujQf0RknE5bU&m=_7
> XC3mQ36QrHUHiA_f9ivQG7Gv3A5CCo7hzqnwzDiUg&s=cYBWJe3lpRaC3_XAoD6gHQ-jqs
> dBsyWEhmVglgHvER0&e= Post images on
> https://urldefense.proofpoint.com/v2/url?u=http-3A__www.imgur.com&d=DwIFaQ&c=j5oPpO0eBH1iio48DtsedeElZfc04rx3ExJHeIIZuCs&r=E0xNnPAQpUbDiPlC50tp7rW2nBkvV7fujQf0RknE5bU&m=_7XC3mQ36QrHUHiA_f9ivQG7Gv3A5CCo7hzqnwzDiUg&s=9DQPN2av9zX1qTkgbokyyvVjZpyls1PWwtF4kVdFiU8&e= and include the link in your posting.
> *****
>
> Because on the color wheel violet is direct opposite of yellow...
> Yellow sunsets in the northern hemisphere, violet sunsets in the
> southern hemisphere...
> Linda
>
>
>
>
> On Mon, Aug 19, 2019 at 7:36 PM Claire Brown <[hidden email]>
> wrote:
> >
> > *****
> > To join, leave or search the confocal microscopy listserv, go to:
> > https://urldefense.proofpoint.com/v2/url?u=http-3A__lists.umn.edu_cg
> > i-2Dbin_wa-3FA0-3Dconfocalmicroscopy&d=DwIFaQ&c=j5oPpO0eBH1iio48Dtse
> > deElZfc04rx3ExJHeIIZuCs&r=E0xNnPAQpUbDiPlC50tp7rW2nBkvV7fujQf0RknE5b
> > U&m=_7XC3mQ36QrHUHiA_f9ivQG7Gv3A5CCo7hzqnwzDiUg&s=cYBWJe3lpRaC3_XAoD
> > 6gHQ-jqsdBsyWEhmVglgHvER0&e= Post images on
> > https://urldefense.proofpoint.com/v2/url?u=http-3A__www.imgur.com&d=
> > DwIFaQ&c=j5oPpO0eBH1iio48DtsedeElZfc04rx3ExJHeIIZuCs&r=E0xNnPAQpUbDi
> > PlC50tp7rW2nBkvV7fujQf0RknE5bU&m=_7XC3mQ36QrHUHiA_f9ivQG7Gv3A5CCo7hz
> > qnwzDiUg&s=9DQPN2av9zX1qTkgbokyyvVjZpyls1PWwtF4kVdFiU8&e= and
> > include the link in your
> posting.
> > *****
> >
> > I’ll apologize in advance for the non-microscopy question but I
> > thought
> someone on the list might be able to answer. Does anyone know why the
> sunsets in Australia are violet?
>

--
Benjamin E. Smith, Ph. D.
Imaging Specialist, Vision Science
University of California, Berkeley
195 Life Sciences Addition
Berkeley, CA 94720-3200
Tel (510) 642-9712
Fax (510) 643-6791
e-mail: [hidden email]
https://urldefense.proofpoint.com/v2/url?u=http-3A__vision.berkeley.edu_-3Fpage-5Fid-3D5635&d=DwIFaQ&c=j5oPpO0eBH1iio48DtsedeElZfc04rx3ExJHeIIZuCs&r=E0xNnPAQpUbDiPlC50tp7rW2nBkvV7fujQf0RknE5bU&m=_7XC3mQ36QrHUHiA_f9ivQG7Gv3A5CCo7hzqnwzDiUg&s=rc_tx4pTLX6bXytEkmcRgP2-nhIExmWxzhNviz5TGv0&e= <https://urldefense.proofpoint.com/v2/url?u=http-3A__vision.berkeley.edu_&d=DwIFaQ&c=j5oPpO0eBH1iio48DtsedeElZfc04rx3ExJHeIIZuCs&r=E0xNnPAQpUbDiPlC50tp7rW2nBkvV7fujQf0RknE5bU&m=_7XC3mQ36QrHUHiA_f9ivQG7Gv3A5CCo7hzqnwzDiUg&s=hdexXcJKbH7lpymB6s3Cprt5Q1Xfy3RYB2Jb6Nrg1Gk&e= >

Martin Wessendorf-2

Re: Random Question

In reply to this post by Claire Brown

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Dear Ms. Brown--

A bit more information would help.

--By "violet", do you mean a hue corresponding roughly to something in
the 400-450 nm range? --Does there seem to be any red or other colors
mixed in with the classic "violet" hue?

--Do sunsets appear to be violet in all parts of Australia and at all
times, or just in specific places--or at specific times?

--Do you wear glasses or contact lenses?

Thanks!

Martin Wessendorf

On 8/19/2019 6:32 PM, Claire Brown wrote:
> *****
> To join, leave or search the confocal microscopy listserv, go to:
> http://lists.umn.edu/cgi-bin/wa?A0=confocalmicroscopy
> Post images on http://www.imgur.com and include the link in your posting.
> *****
>
> I’ll apologize in advance for the non-microscopy question but I thought someone on the list might be able to answer. Does anyone know why the sunsets in Australia are violet?

--
Martin Wessendorf, Ph.D. office: (612) 626-0145
Assoc Prof, Dept Neuroscience lab: (612) 624-2991
University of Minnesota Preferred FAX: (612) 624-8118
6-145 Jackson Hall, 321 Church St. SE Dept Fax: (612) 626-5009
Minneapolis, MN 55455 e-mail: [hidden email]
My preferred pronouns are "he", "him", and "his"

mmodel

Re: Random Question

In reply to this post by Cammer, Michael

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There is an old but wonderful book by Minnaert, Light and Color in the Outdoors. I read it many years ago, it was literally eye-opening

Mike

-----Original Message-----
From: Confocal Microscopy List <[hidden email]> On Behalf Of Cammer, Michael
Sent: Tuesday, August 20, 2019 9:34 AM
To: [hidden email]
Subject: Re: Random Question

*****
To join, leave or search the confocal microscopy listserv, go to:
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Post images on http://www.imgur.com and include the link in your posting.
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I just scrolled through a few hundred sunset pictures from a Google search for "sunsets australia" and don’t see how they are different from sunsets (or pics of sunsets) from north of the equator or other parts of the world. Perhaps the answer lies in the particular locations, times, and perceptions of sunsets to which you refer in contrast to others.
When people come to me with image analysis issues or reporting phenomena from samples or instrumentation, I usually need to see pictures, preferably raw data with the metadata intact.
Cheers-
Michael C.

-----Original Message-----
From: Confocal Microscopy List <[hidden email]> On Behalf Of Benjamin Smith
Sent: Monday, August 19, 2019 11:26 PM
To: [hidden email]
Subject: Re: Random Question

*****
To join, leave or search the confocal microscopy listserv, go to:
https://urldefense.proofpoint.com/v2/url?u=http-3A__lists.umn.edu_cgi-2Dbin_wa-3FA0-3Dconfocalmicroscopy&d=DwIFaQ&c=j5oPpO0eBH1iio48DtsedeElZfc04rx3ExJHeIIZuCs&r=E0xNnPAQpUbDiPlC50tp7rW2nBkvV7fujQf0RknE5bU&m=_7XC3mQ36QrHUHiA_f9ivQG7Gv3A5CCo7hzqnwzDiUg&s=cYBWJe3lpRaC3_XAoD6gHQ-jqsdBsyWEhmVglgHvER0&e=
Post images on https://urldefense.proofpoint.com/v2/url?u=http-3A__www.imgur.com&d=DwIFaQ&c=j5oPpO0eBH1iio48DtsedeElZfc04rx3ExJHeIIZuCs&r=E0xNnPAQpUbDiPlC50tp7rW2nBkvV7fujQf0RknE5bU&m=_7XC3mQ36QrHUHiA_f9ivQG7Gv3A5CCo7hzqnwzDiUg&s=9DQPN2av9zX1qTkgbokyyvVjZpyls1PWwtF4kVdFiU8&e= and include the link in your posting.
*****

Along the lines of what Doug said, the upper atmosphere can be blue while dust or smoke in the troposphere can increase the amount of red. If they balance out you get pink. In the Midwest this would often happen during planting or harvest due to the extra agricultural dust in the air (made for amazing sunrises and sunsets). According to this ( https://urldefense.proofpoint.com/v2/url?u=https-3A__ipad.fas.usda.gov_rssiws_al_crop-5Fcalendar_as.aspx&d=DwIFaQ&c=j5oPpO0eBH1iio48DtsedeElZfc04rx3ExJHeIIZuCs&r=E0xNnPAQpUbDiPlC50tp7rW2nBkvV7fujQf0RknE5bU&m=_7XC3mQ36QrHUHiA_f9ivQG7Gv3A5CCo7hzqnwzDiUg&s=hUxAnDBngI9mVIWeAHHaT7xQ88srySkSbQw6Xru1qCo&e= ), Australia is right in between planting and harvest, so it is unlikely to be agricultural. Australia is however prone to dust storms, so if a low pressure front kicked up some dust from the outback, that could also cause a violet sunset. If the area you are in is generally flat, this will also cause more pronounced sunsets.

-Ben Smith

On Mon, Aug 19, 2019 at 5:57 PM Linda Barthel <[hidden email]> wrote:

Oshel, Philip Eugene

Re: Random Question

In reply to this post by Cammer, Michael

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Maybe not the color of the sunset?
I think there is a misspelling - not "violet" sunset, but "violent" sunset. Because everything in Australia will kill you ...

Philip Oshel

-----Original Message-----
From: Confocal Microscopy List <[hidden email]> on behalf of "Cammer, Michael" <[hidden email]>
Reply-To: Confocal Microscopy List <[hidden email]>
Date: Tuesday, 20August, 2019 at 09:55
To: "[hidden email]" <[hidden email]>
Subject: Re: Random Question

*****
To join, leave or search the confocal microscopy listserv, go to:
http://lists.umn.edu/cgi-bin/wa?A0=confocalmicroscopy
Post images on http://www.imgur.com and include the link in your posting.
*****

I just scrolled through a few hundred sunset pictures from a Google search for "sunsets australia" and don’t see how they are different from sunsets (or pics of sunsets) from north of the equator or other parts of the world. Perhaps the answer lies in the particular locations, times, and perceptions of sunsets to which you refer in contrast to others.
When people come to me with image analysis issues or reporting phenomena from samples or instrumentation, I usually need to see pictures, preferably raw data with the metadata intact.
Cheers-
Michael C.

-----Original Message-----
From: Confocal Microscopy List <[hidden email]> On Behalf Of Benjamin Smith
Sent: Monday, August 19, 2019 11:26 PM
To: [hidden email]
Subject: Re: Random Question

*****
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Post images on https://urldefense.proofpoint.com/v2/url?u=http-3A__www.imgur.com&d=DwIFaQ&c=j5oPpO0eBH1iio48DtsedeElZfc04rx3ExJHeIIZuCs&r=E0xNnPAQpUbDiPlC50tp7rW2nBkvV7fujQf0RknE5bU&m=_7XC3mQ36QrHUHiA_f9ivQG7Gv3A5CCo7hzqnwzDiUg&s=9DQPN2av9zX1qTkgbokyyvVjZpyls1PWwtF4kVdFiU8&e= and include the link in your posting.
*****

Along the lines of what Doug said, the upper atmosphere can be blue while dust or smoke in the troposphere can increase the amount of red. If they balance out you get pink. In the Midwest this would often happen during planting or harvest due to the extra agricultural dust in the air (made for amazing sunrises and sunsets). According to this ( https://urldefense.proofpoint.com/v2/url?u=https-3A__ipad.fas.usda.gov_rssiws_al_crop-5Fcalendar_as.aspx&d=DwIFaQ&c=j5oPpO0eBH1iio48DtsedeElZfc04rx3ExJHeIIZuCs&r=E0xNnPAQpUbDiPlC50tp7rW2nBkvV7fujQf0RknE5bU&m=_7XC3mQ36QrHUHiA_f9ivQG7Gv3A5CCo7hzqnwzDiUg&s=hUxAnDBngI9mVIWeAHHaT7xQ88srySkSbQw6Xru1qCo&e= ), Australia is right in between planting and harvest, so it is unlikely to be agricultural. Australia is however prone to dust storms, so if a low pressure front kicked up some dust from the outback, that could also cause a violet sunset. If the area you are in is generally flat, this will also cause more pronounced sunsets.

-Ben Smith

On Mon, Aug 19, 2019 at 5:57 PM Linda Barthel <[hidden email]> wrote:

> *****
> To join, leave or search the confocal microscopy listserv, go to:
> https://urldefense.proofpoint.com/v2/url?u=http-3A__lists.umn.edu_cgi-
> 2Dbin_wa-3FA0-3Dconfocalmicroscopy&d=DwIFaQ&c=j5oPpO0eBH1iio48DtsedeEl
> Zfc04rx3ExJHeIIZuCs&r=E0xNnPAQpUbDiPlC50tp7rW2nBkvV7fujQf0RknE5bU&m=_7
> XC3mQ36QrHUHiA_f9ivQG7Gv3A5CCo7hzqnwzDiUg&s=cYBWJe3lpRaC3_XAoD6gHQ-jqs
> dBsyWEhmVglgHvER0&e= Post images on
> https://urldefense.proofpoint.com/v2/url?u=http-3A__www.imgur.com&d=DwIFaQ&c=j5oPpO0eBH1iio48DtsedeElZfc04rx3ExJHeIIZuCs&r=E0xNnPAQpUbDiPlC50tp7rW2nBkvV7fujQf0RknE5bU&m=_7XC3mQ36QrHUHiA_f9ivQG7Gv3A5CCo7hzqnwzDiUg&s=9DQPN2av9zX1qTkgbokyyvVjZpyls1PWwtF4kVdFiU8&e= and include the link in your posting.
> *****
>
> Because on the color wheel violet is direct opposite of yellow...
> Yellow sunsets in the northern hemisphere, violet sunsets in the
> southern hemisphere...
> Linda
>
>
>
>
> On Mon, Aug 19, 2019 at 7:36 PM Claire Brown <[hidden email]>
> wrote:
> >
> > *****
> > To join, leave or search the confocal microscopy listserv, go to:
> > https://urldefense.proofpoint.com/v2/url?u=http-3A__lists.umn.edu_cg
> > i-2Dbin_wa-3FA0-3Dconfocalmicroscopy&d=DwIFaQ&c=j5oPpO0eBH1iio48Dtse
> > deElZfc04rx3ExJHeIIZuCs&r=E0xNnPAQpUbDiPlC50tp7rW2nBkvV7fujQf0RknE5b
> > U&m=_7XC3mQ36QrHUHiA_f9ivQG7Gv3A5CCo7hzqnwzDiUg&s=cYBWJe3lpRaC3_XAoD
> > 6gHQ-jqsdBsyWEhmVglgHvER0&e= Post images on
> > https://urldefense.proofpoint.com/v2/url?u=http-3A__www.imgur.com&d=
> > DwIFaQ&c=j5oPpO0eBH1iio48DtsedeElZfc04rx3ExJHeIIZuCs&r=E0xNnPAQpUbDi
> > PlC50tp7rW2nBkvV7fujQf0RknE5bU&m=_7XC3mQ36QrHUHiA_f9ivQG7Gv3A5CCo7hz
> > qnwzDiUg&s=9DQPN2av9zX1qTkgbokyyvVjZpyls1PWwtF4kVdFiU8&e= and
> > include the link in your
> posting.
> > *****
> >
> > I’ll apologize in advance for the non-microscopy question but I
> > thought
> someone on the list might be able to answer. Does anyone know why the
> sunsets in Australia are violet?
>

--
Benjamin E. Smith, Ph. D.
Imaging Specialist, Vision Science
University of California, Berkeley
195 Life Sciences Addition
Berkeley, CA 94720-3200
Tel (510) 642-9712
Fax (510) 643-6791
e-mail: [hidden email]
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ijeomaixrfsystems

Re: Random Question

In reply to this post by Claire Brown

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Here's an article about the violet/red skys in Australia
https://www.abc.net.au/news/2016-05-13/sydney-treated-to-a-week-of-spectacular-sunrises/7409772

Alex Asanov

Re: Random Question

In reply to this post by Claire Brown

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Dear Ms. Brown,

They are violet not only in Australia. In North Carolina, at Jordan Lake, we frequently observe sunset colors in the sky similar to that I observed in Adelaide, Australia. These colors are indeed perceived as violet, a mystical mix of red and violet. If violet indeed is present, likely it comes from the scatter in the air, which makes the sky blue, dark blue at dusk. However, nobody looked at their spectra yet. At least to my knowledge. I suggest we make a fun experiment. I will make a couple of shots at Jordan Lake in North Carolina, using my iPhone 6s with 400-450 nm, 450-550 nm, 550-700 nm bandpass filters and no-filter. You may do the same in Australia. It is important that we have the same or similar cameras. iPhone 6s changes the colors to more "saturated" than they are perceived by human eye. The comparison, if we make it correctly, can be useful to the entire confocal community to remind how much it depends on emotions, the hardware and the software of cameras, and on application of hard and soft filters.

Best regards,
Alexander N. Asanov, Ph.D.
President, TIRF Labs
106 Grendon Place
Cary, NC 27519

[hidden email]
www.tirf-labs.com www.TIRFmicroscopy.com
www.i-diagnostics.net

-----Original Message-----
From: Confocal Microscopy List [mailto:[hidden email]] On Behalf Of Martin Wessendorf
Sent: Tuesday, August 20, 2019 9:34 AM
To: [hidden email]
Subject: Re: Random Question

*****
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Dear Ms. Brown--

A bit more information would help.

--By "violet", do you mean a hue corresponding roughly to something in
the 400-450 nm range? --Does there seem to be any red or other colors
mixed in with the classic "violet" hue?

--Do sunsets appear to be violet in all parts of Australia and at all
times, or just in specific places--or at specific times?

--Do you wear glasses or contact lenses?

Thanks!

Martin Wessendorf

On 8/19/2019 6:32 PM, Claire Brown wrote:
> *****
> To join, leave or search the confocal microscopy listserv, go to:
> http://lists.umn.edu/cgi-bin/wa?A0=confocalmicroscopy
> Post images on http://www.imgur.com and include the link in your posting.
> *****
>
> I’ll apologize in advance for the non-microscopy question but I thought someone on the list might be able to answer. Does anyone know why the sunsets in Australia are violet?

--
Martin Wessendorf, Ph.D. office: (612) 626-0145
Assoc Prof, Dept Neuroscience lab: (612) 624-2991
University of Minnesota Preferred FAX: (612) 624-8118
6-145 Jackson Hall, 321 Church St. SE Dept Fax: (612) 626-5009
Minneapolis, MN 55455 e-mail: [hidden email]
My preferred pronouns are "he", "him", and "his"

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Cammer, Michael

Re: Random Question

In reply to this post by Oshel, Philip Eugene

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From the overwhelming response to this question, it is clear that an in depth study will need to be taken whereby at least twenty scientists from around the world need to witness at least two weeks of these sunsets in situ as a preliminary step. I am sure many of us would like to accept Australia's hospitality in addressing this thorny question.
Cheers-
Michael C

-----Original Message-----
From: Confocal Microscopy List <[hidden email]> On Behalf Of Oshel, Philip Eugene
Sent: Tuesday, August 20, 2019 10:05 AM
To: [hidden email]
Subject: Re: Random Question

Maybe not the color of the sunset?
I think there is a misspelling - not "violet" sunset, but "violent" sunset. Because everything in Australia will kill you ...

Philip Oshel

-----Original Message-----
From: Confocal Microscopy List <[hidden email]> on behalf of "Cammer, Michael" <[hidden email]>
Reply-To: Confocal Microscopy List <[hidden email]>
Date: Tuesday, 20August, 2019 at 09:55
To: "[hidden email]" <[hidden email]>
Subject: Re: Random Question

*****
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Post images on https://urldefense.proofpoint.com/v2/url?u=http-3A__www.imgur.com&d=DwIGaQ&c=j5oPpO0eBH1iio48DtsedeElZfc04rx3ExJHeIIZuCs&r=E0xNnPAQpUbDiPlC50tp7rW2nBkvV7fujQf0RknE5bU&m=Sfp2IPHveZzSkoIROJ7liICFupXedZX8jjwIYAe1tBg&s=qp6Thd8AZUcVsCGwrPSGNAteeCLQlIFJTccOtDCHxng&e= and include the link in your posting.
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I just scrolled through a few hundred sunset pictures from a Google search for "sunsets australia" and don’t see how they are different from sunsets (or pics of sunsets) from north of the equator or other parts of the world. Perhaps the answer lies in the particular locations, times, and perceptions of sunsets to which you refer in contrast to others.
When people come to me with image analysis issues or reporting phenomena from samples or instrumentation, I usually need to see pictures, preferably raw data with the metadata intact.
Cheers-
Michael C.

-----Original Message-----
From: Confocal Microscopy List <[hidden email]> On Behalf Of Benjamin Smith
Sent: Monday, August 19, 2019 11:26 PM
To: [hidden email]
Subject: Re: Random Question

*****
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Post images on https://urldefense.proofpoint.com/v2/url?u=http-3A__www.imgur.com&d=DwIFaQ&c=j5oPpO0eBH1iio48DtsedeElZfc04rx3ExJHeIIZuCs&r=E0xNnPAQpUbDiPlC50tp7rW2nBkvV7fujQf0RknE5bU&m=_7XC3mQ36QrHUHiA_f9ivQG7Gv3A5CCo7hzqnwzDiUg&s=9DQPN2av9zX1qTkgbokyyvVjZpyls1PWwtF4kVdFiU8&e= and include the link in your posting.
*****

Along the lines of what Doug said, the upper atmosphere can be blue while dust or smoke in the troposphere can increase the amount of red. If they balance out you get pink. In the Midwest this would often happen during planting or harvest due to the extra agricultural dust in the air (made for amazing sunrises and sunsets). According to this ( https://urldefense.proofpoint.com/v2/url?u=https-3A__ipad.fas.usda.gov_rssiws_al_crop-5Fcalendar_as.aspx&d=DwIFaQ&c=j5oPpO0eBH1iio48DtsedeElZfc04rx3ExJHeIIZuCs&r=E0xNnPAQpUbDiPlC50tp7rW2nBkvV7fujQf0RknE5bU&m=_7XC3mQ36QrHUHiA_f9ivQG7Gv3A5CCo7hzqnwzDiUg&s=hUxAnDBngI9mVIWeAHHaT7xQ88srySkSbQw6Xru1qCo&e= ), Australia is right in between planting and harvest, so it is unlikely to be agricultural. Australia is however prone to dust storms, so if a low pressure front kicked up some dust from the outback, that could also cause a violet sunset. If the area you are in is generally flat, this will also cause more pronounced sunsets.

-Ben Smith

On Mon, Aug 19, 2019 at 5:57 PM Linda Barthel <[hidden email]> wrote:

> *****
> To join, leave or search the confocal microscopy listserv, go to:
> https://urldefense.proofpoint.com/v2/url?u=http-3A__lists.umn.edu_cgi-
> 2Dbin_wa-3FA0-3Dconfocalmicroscopy&d=DwIFaQ&c=j5oPpO0eBH1iio48DtsedeEl
> Zfc04rx3ExJHeIIZuCs&r=E0xNnPAQpUbDiPlC50tp7rW2nBkvV7fujQf0RknE5bU&m=_7
> XC3mQ36QrHUHiA_f9ivQG7Gv3A5CCo7hzqnwzDiUg&s=cYBWJe3lpRaC3_XAoD6gHQ-jqs
> dBsyWEhmVglgHvER0&e= Post images on
> https://urldefense.proofpoint.com/v2/url?u=http-3A__www.imgur.com&d=DwIFaQ&c=j5oPpO0eBH1iio48DtsedeElZfc04rx3ExJHeIIZuCs&r=E0xNnPAQpUbDiPlC50tp7rW2nBkvV7fujQf0RknE5bU&m=_7XC3mQ36QrHUHiA_f9ivQG7Gv3A5CCo7hzqnwzDiUg&s=9DQPN2av9zX1qTkgbokyyvVjZpyls1PWwtF4kVdFiU8&e= and include the link in your posting.
> *****
>
> Because on the color wheel violet is direct opposite of yellow...
> Yellow sunsets in the northern hemisphere, violet sunsets in the
> southern hemisphere...
> Linda
>
>
>
>
> On Mon, Aug 19, 2019 at 7:36 PM Claire Brown <[hidden email]>
> wrote:
> >
> > *****
> > To join, leave or search the confocal microscopy listserv, go to:
> > https://urldefense.proofpoint.com/v2/url?u=http-3A__lists.umn.edu_cg
> > i-2Dbin_wa-3FA0-3Dconfocalmicroscopy&d=DwIFaQ&c=j5oPpO0eBH1iio48Dtse
> > deElZfc04rx3ExJHeIIZuCs&r=E0xNnPAQpUbDiPlC50tp7rW2nBkvV7fujQf0RknE5b
> > U&m=_7XC3mQ36QrHUHiA_f9ivQG7Gv3A5CCo7hzqnwzDiUg&s=cYBWJe3lpRaC3_XAoD
> > 6gHQ-jqsdBsyWEhmVglgHvER0&e= Post images on
> > https://urldefense.proofpoint.com/v2/url?u=http-3A__www.imgur.com&d=
> > DwIFaQ&c=j5oPpO0eBH1iio48DtsedeElZfc04rx3ExJHeIIZuCs&r=E0xNnPAQpUbDi
> > PlC50tp7rW2nBkvV7fujQf0RknE5bU&m=_7XC3mQ36QrHUHiA_f9ivQG7Gv3A5CCo7hz
> > qnwzDiUg&s=9DQPN2av9zX1qTkgbokyyvVjZpyls1PWwtF4kVdFiU8&e= and
> > include the link in your
> posting.
> > *****
> >
> > I’ll apologize in advance for the non-microscopy question but I
> > thought
> someone on the list might be able to answer. Does anyone know why the
> sunsets in Australia are violet?
>

--
Benjamin E. Smith, Ph. D.
Imaging Specialist, Vision Science
University of California, Berkeley
195 Life Sciences Addition
Berkeley, CA 94720-3200
Tel (510) 642-9712
Fax (510) 643-6791
e-mail: [hidden email]
https://urldefense.proofpoint.com/v2/url?u=http-3A__vision.berkeley.edu_-3Fpage-5Fid-3D5635&d=DwIFaQ&c=j5oPpO0eBH1iio48DtsedeElZfc04rx3ExJHeIIZuCs&r=E0xNnPAQpUbDiPlC50tp7rW2nBkvV7fujQf0RknE5bU&m=_7XC3mQ36QrHUHiA_f9ivQG7Gv3A5CCo7hzqnwzDiUg&s=rc_tx4pTLX6bXytEkmcRgP2-nhIExmWxzhNviz5TGv0&e= <https://urldefense.proofpoint.com/v2/url?u=http-3A__vision.berkeley.edu_&d=DwIFaQ&c=j5oPpO0eBH1iio48DtsedeElZfc04rx3ExJHeIIZuCs&r=E0xNnPAQpUbDiPlC50tp7rW2nBkvV7fujQf0RknE5bU&m=_7XC3mQ36QrHUHiA_f9ivQG7Gv3A5CCo7hzqnwzDiUg&s=hdexXcJKbH7lpymB6s3Cprt5Q1Xfy3RYB2Jb6Nrg1Gk&e= >

Alex Asanov

Re: Random Question

In reply to this post by Benjamin Smith

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Good note, Ben, about dust and smoke in the troposphere. There is a small group in Israel, which since the foundation of Israel performs the observation of "global dimming." Dust and smoke of natural and anthropogenic origin are important factors for energy balance. The climate often cools down after volcano eruption, despite of large amounts of greenhouse gasses. Often we have pink sunsets instead of warming.

Best regards,
Alexander N. Asanov, Ph.D.
President, TIRF Labs
106 Grendon Place
Cary, NC 27519

[hidden email]
www.tirf-labs.com www.TIRFmicroscopy.com
www.i-diagnostics.net

-----Original Message-----
From: Confocal Microscopy List [mailto:[hidden email]] On Behalf Of Benjamin Smith
Sent: Monday, August 19, 2019 11:26 PM
To: [hidden email]
Subject: Re: Random Question

*****
To join, leave or search the confocal microscopy listserv, go to:
http://lists.umn.edu/cgi-bin/wa?A0=confocalmicroscopy
Post images on http://www.imgur.com and include the link in your posting.
*****

Along the lines of what Doug said, the upper atmosphere can be blue while
dust or smoke in the troposphere can increase the amount of red. If they
balance out you get pink. In the Midwest this would often happen during
planting or harvest due to the extra agricultural dust in the air (made for
amazing sunrises and sunsets). According to this (
https://ipad.fas.usda.gov/rssiws/al/crop_calendar/as.aspx), Australia is
right in between planting and harvest, so it is unlikely to be
agricultural. Australia is however prone to dust storms, so if a low
pressure front kicked up some dust from the outback, that could also cause
a violet sunset. If the area you are in is generally flat, this will also
cause more pronounced sunsets.

-Ben Smith

On Mon, Aug 19, 2019 at 5:57 PM Linda Barthel <[hidden email]> wrote:

> *****
> To join, leave or search the confocal microscopy listserv, go to:
> http://lists.umn.edu/cgi-bin/wa?A0=confocalmicroscopy
> Post images on http://www.imgur.com and include the link in your posting.
> *****
>
> Because on the color wheel violet is direct opposite of yellow...
> Yellow sunsets in the northern hemisphere, violet sunsets in the
> southern hemisphere...
> Linda
>
>
>
>
> On Mon, Aug 19, 2019 at 7:36 PM Claire Brown <[hidden email]>
> wrote:
> >
> > *****
> > To join, leave or search the confocal microscopy listserv, go to:
> > http://lists.umn.edu/cgi-bin/wa?A0=confocalmicroscopy
> > Post images on http://www.imgur.com and include the link in your
> posting.
> > *****
> >
> > I’ll apologize in advance for the non-microscopy question but I thought
> someone on the list might be able to answer. Does anyone know why the
> sunsets in Australia are violet?
>

--
Benjamin E. Smith, Ph. D.
Imaging Specialist, Vision Science
University of California, Berkeley
195 Life Sciences Addition
Berkeley, CA 94720-3200
Tel (510) 642-9712
Fax (510) 643-6791
e-mail: [hidden email]
http://vision.berkeley.edu/?page_id=5635 <http://vision.berkeley.edu/>

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Re: Random Question

In reply to this post by Cammer, Michael

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I would like to add an aim to Michael's grant proposal to look into
biological factors, and specifically the issue of blood rushing up into the
heads of Australians from being upside-down all the time causing the sky to
look violet.

-Ben Smith

On Tue, Aug 20, 2019 at 9:08 AM Cammer, Michael <
[hidden email]> wrote:

> *****
> To join, leave or search the confocal microscopy listserv, go to:
> http://lists.umn.edu/cgi-bin/wa?A0=confocalmicroscopy
> Post images on http://www.imgur.com and include the link in your posting.
> *****
>
> From the overwhelming response to this question, it is clear that an in
> depth study will need to be taken whereby at least twenty scientists from
> around the world need to witness at least two weeks of these sunsets in
> situ as a preliminary step. I am sure many of us would like to accept
> Australia's hospitality in addressing this thorny question.
> Cheers-
> Michael C
>
> -----Original Message-----
> From: Confocal Microscopy List <[hidden email]> On
> Behalf Of Oshel, Philip Eugene
> Sent: Tuesday, August 20, 2019 10:05 AM
> To: [hidden email]
> Subject: Re: Random Question
>
>
> Maybe not the color of the sunset?
> I think there is a misspelling - not "violet" sunset, but "violent"
> sunset. Because everything in Australia will kill you ...
>
> Philip Oshel
>
> -----Original Message-----
> From: Confocal Microscopy List <[hidden email]> on
> behalf of "Cammer, Michael" <[hidden email]>
> Reply-To: Confocal Microscopy List <[hidden email]>
> Date: Tuesday, 20August, 2019 at 09:55
> To: "[hidden email]" <[hidden email]>
> Subject: Re: Random Question
>
> *****
> To join, leave or search the confocal microscopy listserv, go to:
>
> https://urldefense.proofpoint.com/v2/url?u=http-3A__lists.umn.edu_cgi-2Dbin_wa-3FA0-3Dconfocalmicroscopy&d=DwIGaQ&c=j5oPpO0eBH1iio48DtsedeElZfc04rx3ExJHeIIZuCs&r=E0xNnPAQpUbDiPlC50tp7rW2nBkvV7fujQf0RknE5bU&m=Sfp2IPHveZzSkoIROJ7liICFupXedZX8jjwIYAe1tBg&s=OVt0H89tLZyfaNvPYdKUQ1qRN28qkVKtqi1D3RG5f-s&e=
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> and include the link in your posting.
> *****
>
> I just scrolled through a few hundred sunset pictures from a Google
> search for "sunsets australia" and don’t see how they are different from
> sunsets (or pics of sunsets) from north of the equator or other parts of
> the world. Perhaps the answer lies in the particular locations, times, and
> perceptions of sunsets to which you refer in contrast to others.
> When people come to me with image analysis issues or reporting
> phenomena from samples or instrumentation, I usually need to see pictures,
> preferably raw data with the metadata intact.
> Cheers-
> Michael C.
>
> -----Original Message-----
> From: Confocal Microscopy List <[hidden email]> On
> Behalf Of Benjamin Smith
> Sent: Monday, August 19, 2019 11:26 PM
> To: [hidden email]
> Subject: Re: Random Question
>
> *****
> To join, leave or search the confocal microscopy listserv, go to:
>
> https://urldefense.proofpoint.com/v2/url?u=http-3A__lists.umn.edu_cgi-2Dbin_wa-3FA0-3Dconfocalmicroscopy&d=DwIFaQ&c=j5oPpO0eBH1iio48DtsedeElZfc04rx3ExJHeIIZuCs&r=E0xNnPAQpUbDiPlC50tp7rW2nBkvV7fujQf0RknE5bU&m=_7XC3mQ36QrHUHiA_f9ivQG7Gv3A5CCo7hzqnwzDiUg&s=cYBWJe3lpRaC3_XAoD6gHQ-jqsdBsyWEhmVglgHvER0&e=
> Post images on
> https://urldefense.proofpoint.com/v2/url?u=http-3A__www.imgur.com&d=DwIFaQ&c=j5oPpO0eBH1iio48DtsedeElZfc04rx3ExJHeIIZuCs&r=E0xNnPAQpUbDiPlC50tp7rW2nBkvV7fujQf0RknE5bU&m=_7XC3mQ36QrHUHiA_f9ivQG7Gv3A5CCo7hzqnwzDiUg&s=9DQPN2av9zX1qTkgbokyyvVjZpyls1PWwtF4kVdFiU8&e=
> and include the link in your posting.
> *****
>
> Along the lines of what Doug said, the upper atmosphere can be blue
> while dust or smoke in the troposphere can increase the amount of red. If
> they balance out you get pink. In the Midwest this would often happen
> during planting or harvest due to the extra agricultural dust in the air
> (made for amazing sunrises and sunsets). According to this (
> https://urldefense.proofpoint.com/v2/url?u=https-3A__ipad.fas.usda.gov_rssiws_al_crop-5Fcalendar_as.aspx&d=DwIFaQ&c=j5oPpO0eBH1iio48DtsedeElZfc04rx3ExJHeIIZuCs&r=E0xNnPAQpUbDiPlC50tp7rW2nBkvV7fujQf0RknE5bU&m=_7XC3mQ36QrHUHiA_f9ivQG7Gv3A5CCo7hzqnwzDiUg&s=hUxAnDBngI9mVIWeAHHaT7xQ88srySkSbQw6Xru1qCo&e=
> ), Australia is right in between planting and harvest, so it is unlikely to
> be agricultural. Australia is however prone to dust storms, so if a low
> pressure front kicked up some dust from the outback, that could also cause
> a violet sunset. If the area you are in is generally flat, this will also
> cause more pronounced sunsets.
>
> -Ben Smith
>
>
>
> On Mon, Aug 19, 2019 at 5:57 PM Linda Barthel <[hidden email]>
> wrote:
>
> > *****
> > To join, leave or search the confocal microscopy listserv, go to:
> >
> https://urldefense.proofpoint.com/v2/url?u=http-3A__lists.umn.edu_cgi-
> >
> 2Dbin_wa-3FA0-3Dconfocalmicroscopy&d=DwIFaQ&c=j5oPpO0eBH1iio48DtsedeEl
> >
> Zfc04rx3ExJHeIIZuCs&r=E0xNnPAQpUbDiPlC50tp7rW2nBkvV7fujQf0RknE5bU&m=_7
> >
> XC3mQ36QrHUHiA_f9ivQG7Gv3A5CCo7hzqnwzDiUg&s=cYBWJe3lpRaC3_XAoD6gHQ-jqs
> > dBsyWEhmVglgHvER0&e= Post images on
> >
> https://urldefense.proofpoint.com/v2/url?u=http-3A__www.imgur.com&d=DwIFaQ&c=j5oPpO0eBH1iio48DtsedeElZfc04rx3ExJHeIIZuCs&r=E0xNnPAQpUbDiPlC50tp7rW2nBkvV7fujQf0RknE5bU&m=_7XC3mQ36QrHUHiA_f9ivQG7Gv3A5CCo7hzqnwzDiUg&s=9DQPN2av9zX1qTkgbokyyvVjZpyls1PWwtF4kVdFiU8&e=
> and include the link in your posting.
> > *****
> >
> > Because on the color wheel violet is direct opposite of yellow...
> > Yellow sunsets in the northern hemisphere, violet sunsets in the
> > southern hemisphere...
> > Linda
> >
> >
> >
> >
> > On Mon, Aug 19, 2019 at 7:36 PM Claire Brown <[hidden email]
> >
> > wrote:
> > >
> > > *****
> > > To join, leave or search the confocal microscopy listserv, go to:
> > >
> https://urldefense.proofpoint.com/v2/url?u=http-3A__lists.umn.edu_cg
> > >
> i-2Dbin_wa-3FA0-3Dconfocalmicroscopy&d=DwIFaQ&c=j5oPpO0eBH1iio48Dtse
> > >
> deElZfc04rx3ExJHeIIZuCs&r=E0xNnPAQpUbDiPlC50tp7rW2nBkvV7fujQf0RknE5b
> > >
> U&m=_7XC3mQ36QrHUHiA_f9ivQG7Gv3A5CCo7hzqnwzDiUg&s=cYBWJe3lpRaC3_XAoD
> > > 6gHQ-jqsdBsyWEhmVglgHvER0&e= Post images on
> > >
> https://urldefense.proofpoint.com/v2/url?u=http-3A__www.imgur.com&d=
> > >
> DwIFaQ&c=j5oPpO0eBH1iio48DtsedeElZfc04rx3ExJHeIIZuCs&r=E0xNnPAQpUbDi
> > >
> PlC50tp7rW2nBkvV7fujQf0RknE5bU&m=_7XC3mQ36QrHUHiA_f9ivQG7Gv3A5CCo7hz
> > > qnwzDiUg&s=9DQPN2av9zX1qTkgbokyyvVjZpyls1PWwtF4kVdFiU8&e= and
> > > include the link in your
> > posting.
> > > *****
> > >
> > > I’ll apologize in advance for the non-microscopy question but I
> > > thought
> > someone on the list might be able to answer. Does anyone know why
> the
> > sunsets in Australia are violet?
> >
>
>
> --
> Benjamin E. Smith, Ph. D.
> Imaging Specialist, Vision Science
> University of California, Berkeley
> 195 Life Sciences Addition
> Berkeley, CA 94720-3200
> Tel (510) 642-9712
> Fax (510) 643-6791
> e-mail: [hidden email]
>
> https://urldefense.proofpoint.com/v2/url?u=http-3A__vision.berkeley.edu_-3Fpage-5Fid-3D5635&d=DwIFaQ&c=j5oPpO0eBH1iio48DtsedeElZfc04rx3ExJHeIIZuCs&r=E0xNnPAQpUbDiPlC50tp7rW2nBkvV7fujQf0RknE5bU&m=_7XC3mQ36QrHUHiA_f9ivQG7Gv3A5CCo7hzqnwzDiUg&s=rc_tx4pTLX6bXytEkmcRgP2-nhIExmWxzhNviz5TGv0&e=
> <
> https://urldefense.proofpoint.com/v2/url?u=http-3A__vision.berkeley.edu_&d=DwIFaQ&c=j5oPpO0eBH1iio48DtsedeElZfc04rx3ExJHeIIZuCs&r=E0xNnPAQpUbDiPlC50tp7rW2nBkvV7fujQf0RknE5bU&m=_7XC3mQ36QrHUHiA_f9ivQG7Gv3A5CCo7hzqnwzDiUg&s=hdexXcJKbH7lpymB6s3Cprt5Q1Xfy3RYB2Jb6Nrg1Gk&e=
> >
>
>
>

Jacqueline Ross

Re: Random Question

In reply to this post by Cammer, Michael

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Hi All,

Just have to add my 2 cents worth and say that seeing sunrise and sunset at Uluru in the red centre is the most amazing experience. Many different colours. Thoroughly recommend it!

Cheers,

Jacqui

-----Original Message-----
From: Confocal Microscopy List [mailto:[hidden email]] On Behalf Of Cammer, Michael
Sent: Wednesday, 21 August 2019 1:34 a.m.
To: [hidden email]
Subject: Re: Random Question

*****
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I just scrolled through a few hundred sunset pictures from a Google search for "sunsets australia" and don’t see how they are different from sunsets (or pics of sunsets) from north of the equator or other parts of the world. Perhaps the answer lies in the particular locations, times, and perceptions of sunsets to which you refer in contrast to others.
When people come to me with image analysis issues or reporting phenomena from samples or instrumentation, I usually need to see pictures, preferably raw data with the metadata intact.
Cheers-
Michael C.

-----Original Message-----
From: Confocal Microscopy List <[hidden email]> On Behalf Of Benjamin Smith
Sent: Monday, August 19, 2019 11:26 PM
To: [hidden email]
Subject: Re: Random Question

*****
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https://urldefense.proofpoint.com/v2/url?u=http-3A__lists.umn.edu_cgi-2Dbin_wa-3FA0-3Dconfocalmicroscopy&d=DwIFaQ&c=j5oPpO0eBH1iio48DtsedeElZfc04rx3ExJHeIIZuCs&r=E0xNnPAQpUbDiPlC50tp7rW2nBkvV7fujQf0RknE5bU&m=_7XC3mQ36QrHUHiA_f9ivQG7Gv3A5CCo7hzqnwzDiUg&s=cYBWJe3lpRaC3_XAoD6gHQ-jqsdBsyWEhmVglgHvER0&e=
Post images on https://urldefense.proofpoint.com/v2/url?u=http-3A__www.imgur.com&d=DwIFaQ&c=j5oPpO0eBH1iio48DtsedeElZfc04rx3ExJHeIIZuCs&r=E0xNnPAQpUbDiPlC50tp7rW2nBkvV7fujQf0RknE5bU&m=_7XC3mQ36QrHUHiA_f9ivQG7Gv3A5CCo7hzqnwzDiUg&s=9DQPN2av9zX1qTkgbokyyvVjZpyls1PWwtF4kVdFiU8&e= and include the link in your posting.
*****

Along the lines of what Doug said, the upper atmosphere can be blue while dust or smoke in the troposphere can increase the amount of red. If they balance out you get pink. In the Midwest this would often happen during planting or harvest due to the extra agricultural dust in the air (made for amazing sunrises and sunsets). According to this ( https://urldefense.proofpoint.com/v2/url?u=https-3A__ipad.fas.usda.gov_rssiws_al_crop-5Fcalendar_as.aspx&d=DwIFaQ&c=j5oPpO0eBH1iio48DtsedeElZfc04rx3ExJHeIIZuCs&r=E0xNnPAQpUbDiPlC50tp7rW2nBkvV7fujQf0RknE5bU&m=_7XC3mQ36QrHUHiA_f9ivQG7Gv3A5CCo7hzqnwzDiUg&s=hUxAnDBngI9mVIWeAHHaT7xQ88srySkSbQw6Xru1qCo&e= ), Australia is right in between planting and harvest, so it is unlikely to be agricultural. Australia is however prone to dust storms, so if a low pressure front kicked up some dust from the outback, that could also cause a violet sunset. If the area you are in is generally flat, this will also cause more pronounced sunsets.

-Ben Smith

On Mon, Aug 19, 2019 at 5:57 PM Linda Barthel <[hidden email]> wrote:

Claire Brown

Re: Random Question

In reply to this post by Claire Brown

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I have really enjoyed reading the replies to this question! Fascinating topic that I guess many of us are interested in.

I have only been to Australia once. Last September and I saw a very violet sunset. It stood out to me because I had never seen a sunset of that colour before. Then a friend of mine posted a sunset photo from Australia just a few weeks ago and it had the same violet colour.

Really interesting if this is happening all over the world. I have mostly lived in the Northern part of the Northern hemisphere and as I mentioned I have never seen a violet sunset before.

I love the idea of testing this out with filters but I'd have to ask someone to do that when they witness a violet sunset since I don't live in Australia.
I was trying to understand how uv/violet light would be visible at sunset so I favour the idea of it being a mix of colours and like the idea that it involves a certain particulate or mix of particulate in the sky.

Thanks for the engaging responses!