Coronal mass ejections (CME's) are huge bubble-shaped bursts of solar wind expanding and rising above the corona, or the Sun's outermost part. When a CME erupts from the Sun, magnetized plasma is thrown through the solar wind which creates a disturbance. This disturbance may include a shock wave that accelerates some solar wind particles to high energies as it moves. CME's can cause disturbances in Earth that can be catastrophic.
When the solar cycle is at its minimum, scientist usually observe about one CME every week. When the solar cycle is at its maximum, scientist observe about 2 to 3 CME's every day.
When the solar cycle is at its minimum, scientist usually observe about one CME every week. When the solar cycle is at its maximum, scientist observe about 2 to 3 CME's every day.
http://www.youtube.com/watch?v=h4oLaeV9B0Q Video made by NASA showing pictures and videos of CME's