Neat Image Shows Fury Of Sun

Over time, the interactions of the Sun’s magnetic field drive an increase in solar activity until it reaches what scientists call solar maximum.

https://news.yahoo.com/upcoming-solar-maximum-paint-sky-195455287.html

Then the Sun’s entire magnetic field flips and the Sun calms down for a little while before ramping up again. The Sun’s solar cycle plays out over an 11-year period, characterized by a peak and valley of solar activity.