STEREO - Solar Terrestrial Relations Observatory
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Important notice about STEREO Behind

Two Powerful Coronal Mass Ejections


Two significant coronal mass ejections (CMEs) occurred in less than two days (Nov. 12-14, 2011) as observed by STEREO?s Ahead COR 2 coronagraph. The first event is a halo CME event in that the leading edge of the particle cloud expanded in an arc around the Sun. The cloud was headed right towards the Ahead spacecraft. In the second, larger event the bright cloud is heading out into space and away from Earth. The Sun, represented by the white circle, is blocked out by a black disk so that faint features in the corona can be observed.

Last Revised: March 19, 2018 15:00:39 UTC
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