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Astron. Astrophys. 358, 1097-1108 (2000)

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A spectroscopic study of coronal dimming associated with a coronal mass ejection

R.A. Harrison 1 and M. Lyons 2

1 Space Science and Technology Department, Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire OX11 0QX, UK
2 School of Physics and Space Research, University of Birmingham, Birmingham B15 2TT, UK

Received 22 December 1999 / Accepted 11 April 2000


Extreme ultraviolet spectroscopic observations of one coronal mass ejection event are used to examine the onset phase of the eruption. We find significant dimming of million K plasmas in the low corona under the ascending CME, the activation of an adjacent prominence and 2 million K `hot spots' which may be associated with the CME footpoints. In particular, we show that the dimming is due to a density decrease from million K plasma loss. We compare the mass loss with the CME mass. The observations suggest that the interaction of adjacent coronal loops plays an important role in CME activity and may allow us to pinpoint the source of the CME material.

Key words: Sun: activity – Sun: atmosphere – Sun: corona – Sun: UV radiation

Send offprint requests to: R.A. Harrison

© European Southern Observatory (ESO) 2000

Online publication: June 20, 2000