APOD: A Fire Rainbow over West Virginia (2021 Aug 30)

Comments and questions about the APOD on the main view screen.
User avatar
APOD Robot
Otto Posterman
Posts: 4401
Joined: Fri Dec 04, 2009 3:27 am

APOD: A Fire Rainbow over West Virginia (2021 Aug 30)

Post by APOD Robot » Mon Aug 30, 2021 4:06 am

Image A Fire Rainbow over West Virginia

Explanation: What's happening to this cloud? Ice crystals in a distant cirrus cloud are acting like little floating prisms. Known informally as a fire rainbow for its flame-like appearance, a circumhorizon arc appears parallel to the horizon. For a circumhorizontal arc to be visible, the Sun must be at least 58 degrees high in a sky where cirrus clouds present below -- in this case cirrus fibrates. The numerous, flat, hexagonal ice-crystals that compose the cirrus cloud must be aligned horizontally to properly refract sunlight in a collectively similar manner. Therefore, circumhorizontal arcs are somewhat unusual to see. The featured fire rainbow was photographed earlier this month near North Fork Mountain in West Virginia, USA.

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

User avatar
Ann
4725 Å
Posts: 11513
Joined: Sat May 29, 2010 5:33 am

Re: APOD: A Fire Rainbow over West Virginia (2021 Aug 30)

Post by Ann » Mon Aug 30, 2021 5:38 am


Amazing! It looks like the sky is ablaze with a wildfire of color!

Ann
Color Commentator

FrankTKO
Ensign
Posts: 15
Joined: Tue Dec 07, 2004 5:26 am

Re: APOD: A Fire Rainbow over West Virginia (2021 Aug 30)

Post by FrankTKO » Mon Aug 30, 2021 12:15 pm

I'm not sure I understand the phrase "the Sun must be at least 58 degrees high in a sky where cirrus clouds present below"...

Was the photographer looking up at the sky or was he on a mountain looking level or down?

User avatar
orin stepanek
Plutopian
Posts: 6791
Joined: Wed Jul 27, 2005 3:41 pm
Location: Nebraska

Re: APOD: A Fire Rainbow over West Virginia (2021 Aug 30)

Post by orin stepanek » Mon Aug 30, 2021 12:39 pm

FireRainbow_Harbig_960.jpg
Exactly what I was thinking Ann! The Sky is burning; Aka Henny Penny
The sky is falling! I never knew this phenom existed! 8-)
8121c0291fa14d1fe52b9eb007741cac.jpg
Kitty thinks it's amazing also
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: 18338
Joined: Mon Jan 21, 2008 1:57 pm
Location: Alexandria, Virginia

Re: APOD: A Fire Rainbow over West Virginia (2021 Aug 30)

Post by neufer » Mon Aug 30, 2021 12:59 pm

FrankTKO wrote:
Mon Aug 30, 2021 12:15 pm

I'm not sure I understand the phrase "the Sun must be at least 58 degrees high in a sky where cirrus clouds present below"...

Was the photographer looking up at the sky or was he on a mountain looking level or down?
Art Neuendorffer

ta152h0
Schooled
Posts: 1393
Joined: Mon Aug 29, 2005 12:46 am
Location: Auburn, Washington, USA

Re: APOD: A Fire Rainbow over West Virginia (2021 Aug 30)

Post by ta152h0 » Mon Aug 30, 2021 3:49 pm

Of course all that is true! pass the ice cold one.
Wolf Kotenberg

alcor
Ensign
Posts: 35
Joined: Fri Nov 06, 2015 10:12 pm

Re: APOD: A Fire Rainbow over West Virginia (2021 Aug 30)

Post by alcor » Mon Aug 30, 2021 8:14 pm

Ann wrote:
Mon Aug 30, 2021 5:38 am

Amazing! It looks like the sky is ablaze with a wildfire of color!

Ann
I fully concur ...
Click to play embedded YouTube video.
As Riker says in Star Trek, but due to something quite else.

:D
Arne

heehaw

Re: APOD: A Fire Rainbow over West Virginia (2021 Aug 30)

Post by heehaw » Mon Aug 30, 2021 10:13 pm

It is nice to have ONE planet where we can get close-ups!

User avatar
Chris Peterson
Abominable Snowman
Posts: 16128
Joined: Wed Jan 31, 2007 11:13 pm
Location: Guffey, Colorado, USA

Re: APOD: A Fire Rainbow over West Virginia (2021 Aug 30)

Post by Chris Peterson » Mon Aug 30, 2021 10:15 pm

heehaw wrote:
Mon Aug 30, 2021 10:13 pm
It is nice to have ONE planet where we can get close-ups!
I think it's fair to say that, at the moment, we have two (although with less geographical coverage on one of those).
Chris

*****************************************
Chris L Peterson
Cloudbait Observatory
http://www.cloudbait.com

User avatar
neufer
Vacationer at Tralfamadore
Posts: 18338
Joined: Mon Jan 21, 2008 1:57 pm
Location: Alexandria, Virginia

Re: APOD: A Fire Rainbow over West Virginia (2021 Aug 30)

Post by neufer » Mon Aug 30, 2021 10:44 pm

Click to play embedded YouTube video.
Chris Peterson wrote:
Mon Aug 30, 2021 10:15 pm
heehaw wrote:
Mon Aug 30, 2021 10:13 pm


It is nice to have ONE planet where we can get close-ups!
I think it's fair to say that, at the moment, we have two (although with less geographical coverage on one of those).
Art Neuendorffer