4 September 2014
Approximately every 11 years, the sun undergoes a complete personality change from quiet and calm to violently active. The height of the sun’s activity, known as solar maximum, is a time of numerous sunspots, punctuated with profound eruptions that send radiation and solar particles out into the far reaches of space. However, the timing of the solar cycle is far from precise.
http://feeds.sciencedaily.com/~r/sciencedaily/~3/Sr8RCV7ZqzI/140903204127.htm
