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PostPosted: Tue Dec 17, 2019 7:18 pm 
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Joined: Fri Dec 03, 2004 12:51 pm
Posts: 2462
Location: Stoke-on-Trent
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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PostPosted: Wed Dec 18, 2019 7:39 am 
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Joined: Sun May 11, 2008 6:11 pm
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Location: Portslade, Sussex Lat 50deg 51min Long 0deg 13mins West
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.


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PostPosted: Wed Dec 18, 2019 8:00 am 
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Joined: Fri Dec 03, 2004 12:51 pm
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Location: Stoke-on-Trent
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.


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PostPosted: Wed Dec 18, 2019 8:33 am 
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Joined: Sun May 11, 2008 6:11 pm
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Location: Portslade, Sussex Lat 50deg 51min Long 0deg 13mins West
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


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PostPosted: Wed Dec 18, 2019 4:49 pm 
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Joined: Fri Dec 03, 2004 12:51 pm
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Location: Stoke-on-Trent
Yes, the dogs following their master seems to be quite a popular and accepted one, Mike.

Best wishes, Jeff.


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PostPosted: Wed Dec 18, 2019 5:10 pm 
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Joined: Sun May 11, 2008 6:11 pm
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Location: Portslade, Sussex Lat 50deg 51min Long 0deg 13mins West
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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