Fig6_11 A huge coronal mass ejection

Fig6_11 A huge coronal mass ejection

Fig. 6.11 . A huge coronal mass ejection is seen in this coronagraph image, taken on 5 December 2003 with the Large Angle Spectrometric Coronagraph, abbreviated LASCO, on the Solar and Heliospheric Observatory, or SOHO for short.  The black area corresponds to the occulting disk of the coronagraph that blocks intense sunlight and permits the corona to be seen.  An image of the singly ionized helium, denoted He II, emission of the Sun, taken at about the same time, has been appropriately scaled and superimposed at the center of the LASCO image.  The full-disk helium image was taken at a wavelength of 30.4 nanometers, corresponding to a temperature of about 60,000 K, using the Extreme-ultraviolet Imaging Telescope, or EIT for short, aboard SOHO. (Courtesy of the SOHO LASCO and EIT consortia. SOHO is a project of international cooperation between ESA and NASA.)

Copyright 2010, Professor Kenneth R. Lang, Tufts University