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Дата изменения: Mon Dec 3 11:20:04 2007
Дата индексирования: Sat Dec 29 12:49:13 2007
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Поисковые слова: п п п п п п п п п п п п п п п п п п п п п
A Complete Solar Cycle from SOHO
Astronomy Picture of the Day
    


A Complete Solar Cycle from SOHO
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A Complete Solar Cycle from SOHO
Credit: SOHO - EIT Consortium, ESA, NASA
Explanation: Every eleven years, our Sun goes through a solar cycle. A complete solar cycle has now been imaged by the sun-orbiting SOHO spacecraft, celebrating the 12th anniversary of its launch yesterday. A solar cycle is caused by the changing magnetic field of the Sun, and varies from solar maximum, when sunspot, coronal mass ejection, and flare phenomena are most frequent, to solar minimum, when such activity is relatively infrequent. Solar minimums occurred in 1996 and 2007, while the last solar maximum occurred in 2001 Pictured above is a SOHO image of the Sun in extreme ultraviolet light for each year of the last solar cycle, with images picked to illustrate the relative activity of the Sun.

January
February
March
April
May
June
July
August
September
October
November
December
 < December 2007  
Mo Tu We Th Fr Sa Su





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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: solar cycle - solar maximum - SOHO
Publications with words: solar cycle - solar maximum - SOHO
See also:
All publications on this topic >>