Coronal Mass Ejection

Coronal Mass Ejection

. A huge coronal mass ejection is seen in this coronagraph image, taken on 27 February 2000 with the Large Angle Spectrometric COronagraph (LASCO) on the SOlar and Heliospheric Observatory (SOHO). The white circle denotes the edge of the photosphere, so this mass ejection is about twice as large as the visible Sun. The black area corresponds to the occulting disk of the coronagraph that blocks intense sunlight and permits the corona to be seen. About one hour before this image was taken, another SOHO instrument, the Extreme ultraviolet Imaging Telescope or EIT, detected a filament eruption lower down near the solar chromosphere. (Courtesy of the SOHO LASCO consortium. SOHO is a project of international cooperation between ESA and NASA.)

Copyright 2010, Professor Kenneth R. Lang, Tufts University