Coronal Dimming and the Relationship to Coronal Mass Ejections

Details Coronal Dimming and the Relationship to Coronal Mass Ejections Coronal Dimming and the Relationship to Coronal Mass Ejections

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsh52a0485h&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SH52A-0485

Physics

7509 Corona, 7513 Coronal Mass Ejections, 7549 Ultraviolet Emissions

Scientific paper

Around the onset time of coronal mass ejections (CME) it is frequently observed by the LASCO coronagraphs on SOHO that the mass content of the low corona is depleted. Spectral observations by the coronal diagnostic spectrometer (CDS) (also on SOHO) are able to confirm that this ``coronal dimming'' is in fact due to mass loss rather than temperature variations. An important question is whether the observed mass loss represents the actual mass ejected in the CME, or the mass required to replenish the coronal mass ejected in the CME. Clearly the timing of the mass loss observed in the low corona to the timing of the CME is critical in answering this question. We present recent results of dedicated campaigns using CDS to investigate this phenomenon; and we also examine the LASCO-C1 data from 1996--1998 (June) for additional information on the relationship between CME onsets and coronal dimming.

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