NASA Astronomy Picture of the Day Collection
A Complete Solar Cycle from SOHO
Every eleven years, our Sun goes through a solar cycle. A complete solar cycle [ http://en.wikipedia ] has now been imaged by the sun-orbiting SOHO spacecraft [ http://sohowww.nasc ], celebrating the 12th anniversary of its launch yesterday. A solar cycle [ http://solarscience ] is caused by the changing magnetic field [ http://solar.physic ] of the Sun, and varies from solar maximum [ http://en.wikipedia ], when sunspot [ http://antwrp.gsfc. ], coronal mass ejection [ http://antwrp.gsfc. ], and flare phenomena [ http://antwrp.gsfc. ] 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. This picture is [ http://sohowww.nasc ] composed of a SOHO image of the Sun [ http://antwrp.gsfc. ] in extreme ultraviolet light [ http://science.hq.n ] for each year of the last solar cycle [ http://en.wikipedia ], with images picked to illustrate the relative activity [ http://antwrp.gsfc. ] of the Sun.
Credit and Copyright:
Goddard Space Flight Center (GSFC)
Link To Source