Search found 2 matches
- Tue May 12, 2009 8:19 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: (Not) An Iridescent Cloud Over Ohio (2009 May 12)
- Replies: 19
- Views: 4223
(Not) An Iridescent Cloud Over Ohio (2009 May 12)
This is not an iridescent cloud nor are water droplets responsible. It is a halo, a circumhorizon arc (http://www.atoptics.co.uk/halo/cha2.htm) produced by refraction in hexagonal plate shaped ice crystals in cirrus. Note the structure parallel to the horizon and the structured gradation of color fr...
- Mon Feb 23, 2009 3:54 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: An Etruscan Vase Moon Rising (APOD 2009 February 23)
- Replies: 11
- Views: 1776
Re: An Etruscan Vase Moon Rising (APOD 2009 February 23)
Miraged moonrises/moonsets of this type are created by warmer air beneath cooler air and not a temperature inversion - see
http://www.atoptics.co.uk/fz200.htm
also
http://www.atoptics.co.uk/atoptics/gfimform.htm
Les Cowley
http://www.atoptics.co.uk
http://www.atoptics.co.uk/fz200.htm
also
http://www.atoptics.co.uk/atoptics/gfimform.htm
Les Cowley
http://www.atoptics.co.uk