Sun Halo at Winter Solstice

Solsticehalo_appleton_big

“Sometimes it looks like the Sun is being viewed through a large lens. In the above case, however, there are actually millions of lenses: ice crystals. As water freezes in the upper atmosphere, small, flat, six-sided, ice crystals might be formed. As these crystals flutter to the ground, much time is spent with their faces flat, parallel to the ground. An observer may pass through 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 above image was taken in the morning of the 2000 Winter Solstice near Ames, Iowa, USA. Visible in the image center is the Sun, while two bright sundogs glow prominently from both the left and the right. Also visible behind neighborhood houses and trees are the 22 degree halo, three sun pillars, and the upper tangent arc, all created by sunlight reflecting off of atmospheric ice crystals.”

Credit & Copyright: Philip Appleton (SIRTF Science Center), Caltech

Print it in Moleskine MSK format
This entry was posted in Science. Bookmark the permalink.

4 Responses to Sun Halo at Winter Solstice

  1. Old Brummie Git says:

    Excellent photo and succinct explanation. Thanks for sharing this picture. It really brightened my day in a grey, overcast and dank Brum.

    Now I know why I visit this site…

  2. Pingback: Free animal sex.

  3. Pingback: Granny sex.

  4. Pingback: Carisoprodol phentermine yellow.

Leave a Reply

Your email address will not be published. Required fields are marked *

*

You may use these HTML tags and attributes: <a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <strike> <strong>

Notify me of followup comments via e-mail. You can also subscribe without commenting.

I accept Privacy policy and Terms of use