Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.astronet.ru/db/xware/msg/1198881
Дата изменения: Wed Aug 4 10:38:23 2004
Дата индексирования: Tue Oct 2 18:08:35 2012
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Solar Arcs and Halos
Astronomy Picture of the Day
    


Solar Arcs and Halos
<< Yesterday 4.08.2004 Tomorrow >>
Solar Arcs and Halos
Credit & Copyright: Eva Seidenfaden
Explanation: Have you ever seen a bright halo around the Sun? Unusual halos and arcs were so bright one recent afternoon in Trier, Germany that even casual people on the street noticed them. The fantastic sky display is pictured above and included a 22 degree halo arc, a complete parhelic circle, a circumhorizon arc and even an infralateral arc. A computer simulation has been run that mimics the above rare display. A cloud partially blocked the usually more intense direct glare of the Sun. Sunlight refracting through falling and fluttering hexagonal ice crystals creates such displays. Such atmospheric ice crystals also cause sundogs and Moon halos.

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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.

Based on Astronomy Picture Of the Day

Publications with keywords: Sun - arcs - halo
Publications with words: Sun - arcs - halo
See also:
All publications on this topic >>