As 2011 unfolds, sunspots have returned and they are crackling with activity. On February 15 and again on March 9, Earth orbiting satellites detected a pair of “X-class” solar flares — the most powerful kind of X-ray flare.
As 2011 unfolds, sunspots have returned and they are crackling with activity. On February 15 and again on March 9, Earth orbiting satellites detected a pair of “X-class” solar flares — the most powerful kind of X-ray flare.