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Showing posts with label observations of sunspots. Show all posts
Showing posts with label observations of sunspots. Show all posts

Monday, November 12, 2012

5 ½ years of solar flares


Although at first fleeting look the sun seems always the same, their activity is actually some activity cycles of about 11 years, discovered in 1843 Samuel Heinrich Schwabe, after 17 years of observations of sunspots.

It is often said that last eleven years have actually seen cycles of nine and fourteen others.