[AZ-Observing] Re: NGC6357 - last night
- From: Howard Anderson <handy13@xxxxxxxxxxxxxx>
- To: az-observing@xxxxxxxxxxxxx
- Date: Thu, 08 Jul 2010 18:58:11 -0700
Hi all,
Regarding glories. Yes, there was some response on EVAC when
I posted this some time ago. I researched it heavily on the internet.
I still think it looked like some sort of diffraction/lens effect caused
by air-compression
generated by the plane. Maybe not but I was not totally convinced by the
explanations I found. I have seen "glories" on the clouds surrounding the
shadow of the plane when I was in the Air Force. Somehow, the effect I
was seeing that I posted did not seem to fit exactly into the classes
described by the
articles I found and the ones that were pointed out to me. The plane's
shadow
was far to tiny to be seen...
I just saw the message from Jimmy Ray that came in as I am
writing this.
Great image Jimmy! I see colored diffraction rings in your image.
I once took a "Radiation and Optics" course taught out of Stone's
book of the same name. I could probably derive something from that
book that would satisfy me but last time I got interested in something
("Why is there Dew on my Corrector Plate" -
http://www.astroshow.com/dewtell/dewtell.htm) it took me literally
a month to review Thermodynamics (never had a course in that...) and
to derive the correct set of equations. Near as I can tell, no one ever
posted a solution as general as mine. (There was a solution for an
infinitely thin "leaf" - for agricultural purposes. But nothing about
an object of finite thickness such as a glass plate suspended by two
sawhorses...) Also didn't get any help from the book publisher. I wanted
the "teachers manual" that had solutions to the problems in the book to
help me in my work... :-) No way... :-) It was irritating... :-)
Book I
was using was "Thermal Physics" by Morse...
Anyway, the Glory is very intriguing but I'm not sure I want to devote a
couple
of months to it to derive a solution consistent with the physics of the
situation. Might take much longer. Have to know aerodynamics, fluid
dynamics
and optics at least to derive a solution I think...
--
Thanks,
Howard, in Tempe AZ
Http://www.astroshow.com
http://www.AZcendant.com
http://www.ShastaDaylight.com
Joe Orman wrote:
>Two more good reference books on glories and other atmospheric phenomena are
>"Color and Light in Nature" by David K. Lynch and William Livingston, and
>"Light and Color in the Outdoors" by Marcel Minnaert. I highly recommend
>both.
>
>--Joe
>
>
>----- Original Message -----
>From: "Wayne (aka Mr. Galaxy)"
>To: <az-observing@xxxxxxxxxxxxx>
>Sent: Wednesday, July 07, 2010 9:17 AM
>Subject: [AZ-Observing] Re: NGC6357 - last night
>
>
>I don't know whether anyone has replied to your "unexplained phenomenon"
>video image, but the bright spot in your image is what's called a Glory.
>There is a good book called "Rainbows, Haloes, and Glories" which talks
>about the effect.
>
>
>
>--
>See message header for info on list archives or unsubscribing, and please
>send personal replies to the author, not the list.
>
>
>
>
>
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