Explanation: Have you ever seen a halo around the Sun? This fairly common sight occurs when high thin clouds containing millions of tiny ice crystals cover much of the sky. Each ice crystal acts like a miniature lens. Because most of the crystals have a similar elongated hexagonal shape, light entering one crystal face and exiting through the opposing face refracts 22 degrees, which corresponds to the radius of the Sun Halo. A similar Moon Halo may be visible during the night. The picture was taken in Gunlock, Utah, USA. A flock of birds was caught by chance in the foreground. Exactly how ice-crystals form in clouds remains under investigation.

Lecture: APOD editor to give public talk in Princeton tonight (April 11)

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Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (USRA)
NASA Web Site Statements, Warnings, and Disclaimers
NASA Official: Jay Norris. Specific rights apply.
A service of: LHEA at NASA / GSFC
& Michigan Tech. U.

Publikacii s klyuchevymi slovami: Sun halo - Solnce Publikacii so slovami: Sun halo - Solnce
Sm. takzhe: Treugol'nyi protuberanec nad Solncem Eruptivnyi protuberanec na Solnce Gaiya: vot poyavlyaetsya Solnce Solnechnyi tanec Vozvrashenie znamenitoi aktivnoi oblasti i vspyshka klassa X na Solnce Vybros solnechnogo volokna Smotrya v storonu s solnechnogo zonda "Parker" Vse publikacii na tu zhe temu >>