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Дата изменения: Sun Nov 12 12:07:52 2006
Дата индексирования: Sat Feb 12 05:38:39 2011
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Follow The Spots
Astronomy Picture of the Day
    


Follow The Spots
<< Yesterday 21.10.1999 Tomorrow >>
Follow The Spots
Credit & Copyright: Louis Strous (LMSAL), SOHO - MDI Consortium, ESA, NASA
Explanation: The Sun rotates on its axis about once every 27 days. How can you tell? Just follow the sunspots. This composite picture was constructed from solar images recorded daily by the MDI instrument on board the space-based SOlar and Heliospheric Observatory (SOHO). It shows the Sun's visible surface for most days of August 1999 so that the same sunspots appear many times as the solar rotation carries them across the face of the Sun. Sunspot temperatures are around 5,000 degrees C. but the spots appear dark as they are actually cooler than the surrounding regions of the solar surface. The sequential images of the sunspot groups show how these regions with high magnetic fields change from day to day.

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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 - solar rotation - sunspot
Publications with words: Sun - solar rotation - sunspot
See also:
All publications on this topic >>