Scottish Weather Network Forum

General Information => General Discussion => Topic started by: skyewright on December 31, 2009, 06:12:38 PM



Title: Huge Moon Halo
Post by: skyewright on December 31, 2009, 06:12:38 PM
One of my neighbours saw a huge halo round the moon last night. He's used to seeing ones of about 1 or 2 diameters but this one was at least 15 diameters in size.

He asked if I knew anything about why it might have been so big? I couldn't provide any better answer than that it was presumably ideal conditions. Does anyone here have more info?


Title: Re: Huge Moon Halo
Post by: Budgie on December 31, 2009, 06:53:56 PM
Could be something to do with the ice crystals in the atmosphere due to the low temps at the moment??

Don't forget that tonight is a Blue Moon!!  ;D


Title: Re: Huge Moon Halo
Post by: munrobaggins on December 31, 2009, 10:18:37 PM
Just as budgie says...it's reflection off ice crystals and just like normal rainbows there can be an inner as well as outer bow (circle), in this case, round the moon.


Title: Re: Huge Moon Halo
Post by: skyewright on January 01, 2010, 01:09:05 PM
Just as budgie says...it's reflection off ice crystals and just like normal rainbows there can be an inner as well as outer bow (circle), in this case, round the moon.
Thanks both. I had a feeling that ice crystals came into it somewhere.