APOD: Sun Halo over Sweden (2021 Dec 28)

Comments and questions about the APOD on the main view screen.
User avatar
APOD Robot
Otto Posterman
Posts: 4684
Joined: Fri Dec 04, 2009 3:27 am

APOD: Sun Halo over Sweden (2021 Dec 28)

Post by APOD Robot » Tue Dec 28, 2021 5:05 am

Image Sun Halo over Sweden

Explanation: What's happened to the Sun? Sometimes it looks like the Sun is being viewed through a giant lens. In the featured video, however, there are actually millions of tiny lenses: ice crystals. Water may freeze in the atmosphere into small, flat, six-sided, ice crystals. As these crystals flutter to the ground, much time is spent with their faces flat and parallel to the ground. An observer may find themselves in the same plane as many of the falling ice crystals near sunrise or sunset. During this alignment, each crystal can act like a miniature lens, refracting sunlight into our view and creating phenomena like parhelia, the technical term for sundogs. The featured video was taken in late 2017 on the side of a ski hill at the Vemdalen Ski Resort in central Sweden. Visible in the center is the most direct image of the Sun, while two bright sundogs glow prominently from both the left and the right. Also visible is the bright 22 degree halo -- as well as the rarer and much fainter 46 degree halo -- also created by sunlight refracting through atmospheric ice crystals.

<< Previous APOD This Day in APOD Next APOD >>

User avatar
orin stepanek
Plutopian
Posts: 7602
Joined: Wed Jul 27, 2005 3:41 pm
Location: Nebraska

Re: APOD: Sun Halo over Sweden (2021 Dec 28)

Post by orin stepanek » Tue Dec 28, 2021 4:43 pm

Twas hoping to find a photo of today's video; but no luck! :?
52410bb8e691b267f97d9278_736.jpg
Pretty kitty ts a good observer though!
You do not have the required permissions to view the files attached to this post.
Orin

Smile today; tomorrow's another day!

User avatar
neufer
Vacationer at Tralfamadore
Posts: 18805
Joined: Mon Jan 21, 2008 1:57 pm
Location: Alexandria, Virginia

Re: APOD: Sun Halo over Sweden (2021 Dec 28)

Post by neufer » Tue Dec 28, 2021 7:31 pm

Art Neuendorffer

User avatar
alter-ego
Serendipitous Sleuthhound
Posts: 1043
Joined: Mon Apr 21, 2008 4:51 am
Location: Redmond, WA

Re: APOD: Sun Halo over Sweden (2021 Dec 28)

Post by alter-ego » Tue Dec 28, 2021 8:30 pm

The cat reminds me of Clark Griswold daydreaming about his future pool, among other things... :D
 
Clark Griswold at Window.jpg
You do not have the required permissions to view the files attached to this post.
A pessimist is nothing more than an experienced optimist

User avatar
Fred the Cat
Theoretic Apothekitty
Posts: 839
Joined: Mon Feb 22, 2016 4:09 pm
AKA: Ron
Location: Eagle, Idaho

Re: APOD: Sun Halo over Sweden (2021 Dec 28)

Post by Fred the Cat » Tue Dec 28, 2021 9:45 pm

Good thing these skiers don’t live in a world where water freezes into
lens-shaped
crystals.

These folks would be toast. :oops:
Freddy's Felicity "Only ascertain as a cat box survivor"

User avatar
johnnydeep
Captain
Posts: 1264
Joined: Sun Feb 20, 2011 8:57 pm

Re: APOD: Sun Halo over Sweden (2021 Dec 28)

Post by johnnydeep » Tue Dec 28, 2021 9:54 pm

So, if the two bright spots on either side are sun dogs, what is the bright fountain-looking thing on top?
--
"To B̬̻̋̚o̞̮̚̚l̘̲̀᷾d̫͓᷅ͩḷ̯᷁ͮȳ͙᷊͠ Go......Beyond The F͇̤i̙̖e̤̟l̡͓d͈̹s̙͚ We Know."

User avatar
alter-ego
Serendipitous Sleuthhound
Posts: 1043
Joined: Mon Apr 21, 2008 4:51 am
Location: Redmond, WA

Re: APOD: Sun Halo over Sweden (2021 Dec 28)

Post by alter-ego » Tue Dec 28, 2021 10:27 pm

johnnydeep wrote: Tue Dec 28, 2021 9:54 pm So, if the two bright spots on either side are sun dogs, what is the bright fountain-looking thing on top?
Upper tangent arc
Atmospheric Optics
Tangent Arcs
A pessimist is nothing more than an experienced optimist

User avatar
rj rl
Ensign
Posts: 73
Joined: Tue Jul 23, 2013 3:37 am

Re: APOD: Sun Halo over Sweden (2021 Dec 28)

Post by rj rl » Wed Dec 29, 2021 3:37 pm

johnnydeep wrote: Tue Dec 28, 2021 9:54 pm So, if the two bright spots on either side are sun dogs, what is the bright fountain-looking thing on top?
check out this Cloud Of The Month if you wanna know the names of some of the more rare optical effects:
https://cloudappreciationsociety.org/december-2021/

User avatar
johnnydeep
Captain
Posts: 1264
Joined: Sun Feb 20, 2011 8:57 pm

Re: APOD: Sun Halo over Sweden (2021 Dec 28)

Post by johnnydeep » Wed Dec 29, 2021 4:16 pm

alter-ego wrote: Tue Dec 28, 2021 10:27 pm
johnnydeep wrote: Tue Dec 28, 2021 9:54 pm So, if the two bright spots on either side are sun dogs, what is the bright fountain-looking thing on top?
Upper tangent arc
Atmospheric Optics
Tangent Arcs
rj rl wrote: Wed Dec 29, 2021 3:37 pm
johnnydeep wrote: Tue Dec 28, 2021 9:54 pm So, if the two bright spots on either side are sun dogs, what is the bright fountain-looking thing on top?
check out this Cloud Of The Month if you wanna know the names of some of the more rare optical effects:
https://cloudappreciationsociety.org/december-2021/
Thanks!
--
"To B̬̻̋̚o̞̮̚̚l̘̲̀᷾d̫͓᷅ͩḷ̯᷁ͮȳ͙᷊͠ Go......Beyond The F͇̤i̙̖e̤̟l̡͓d͈̹s̙͚ We Know."