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Sundogs - Monday 16th December 2019
http://forum.popastro.com/viewtopic.php?f=1&t=21418
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Author:  jeff.stevens [ Tue Dec 17, 2019 7:18 pm ]
Post subject:  Sundogs - Monday 16th December 2019

In addition to watching the night sky, I also like to watch the daytime sky, and on Monday our local star treated me to a very pleasing atmospheric effect; Sundogs.

The photo doesn’t really do them justice, as they were quite distinctive and easy to spot. I think I could make out quite a bit of the circle of the 22 degree halo too. It brightened my day.

Best wishes, Jeff.

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Author:  mike a feist [ Wed Dec 18, 2019 7:39 am ]
Post subject:  Re: Sundogs - Monday 16th December 2019

Sunday, 15th December, 1105 UT. Very variable cloud, heavy showers, blustery wind. Went to the window to photograph the hail/rain and...was surprised to see a short piece of colourful
22 degree/ solar halo/sundog to the right of the Sun... and then looking north saw a rainbow. A halo effect and a rainbow at the same time seemed most unusual! regards maf.

Author:  jeff.stevens [ Wed Dec 18, 2019 8:00 am ]
Post subject:  Re: Sundogs - Monday 16th December 2019

Very nice, Mike.

I meant to add the following edit to my post. I was trying to recall why parhelia are called Sundogs. In my head I thought I recalled reading a reference to the God Ra, and that the dogs sat by his side to guard him. However, I notice on the Atmospheric Optics website there is a piece that states there is no reference to this.

It seems, from the brief reading I did, that no one has definitively traced back the origin of the term. I wondered if anyone reading this may be able to cast further light on this?

Best wishes, Jeff.

Author:  mike a feist [ Wed Dec 18, 2019 8:33 am ]
Post subject:  Re: Sundogs - Monday 16th December 2019

I always imagine that it comes simply from the fact that they 'dog' or follow the Sun.
The word 'rainbow' is a bit weird because is you see a 'rainbow' caused by the Moon, it is called a 'moonbow.' Perhaps the daytime arc should be called a 'sunbow'!!! regards maf

Author:  jeff.stevens [ Wed Dec 18, 2019 4:49 pm ]
Post subject:  Re: Sundogs - Monday 16th December 2019

Yes, the dogs following their master seems to be quite a popular and accepted one, Mike.

Best wishes, Jeff.

Author:  mike a feist [ Wed Dec 18, 2019 5:10 pm ]
Post subject:  Re: Sundogs - Monday 16th December 2019

Another 22 deg Solar Halo today, 18th Dec. 2019. 1220-1250 UT, A rather, often broad but broken halo, quite coloured at the top, but variable. Attempted photos from the street. Continues later to observe and photograph it between 1310-1400, when it first improved in brightness and form, as I walked up to the Foredown Tower [..up a very muddy track...]. The halo finally disappeared behind heavier cloud at about 1400 UT. regards maf.

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