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NASA : The X-Ray Sun Over 5.5 Years.

Behold five and a half years worth of full-sun observations from XRT. A
dramatic illustration of the solar cycle, this movie begins about one
year before the first reversed-polarity sunspot ushered in the current
cycle on January 8, 2008. The solar cycle is a periodic variation in the
Sun's activity that is caused by the gradual 'tangling' and eventual
reversal of its magnetic field.

Added: Sep-22-2012 Occurred On: Sep-22-2012
By: vril
Science and Technology, Nature, History, Other
Tags: The X-Ray, Sun, Over 5.5 Years, NASA, SXRT
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