原来是第24年
October 2014
Four solar flares occurred within 5 days from sunspot AR 12192, which is both the largest sunspot of solar cycle 24 and the largest since 1990. On October 19 there was a major X1.1-class solar flare. October 22 an M8.7-class flare was followed the same day by an X1.6 event. The October 24 X3.1-class solar storm was strong enough to trigger a radio blackout. Larger than the planet Jupiter, the AR 12192 sunspot was visible during a partial solar eclipse seen in North America.