Other
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsh52a0450b&link_type=abstract
American Geophysical Union, Fall Meeting 2002, abstract #SH52A-0450
Other
7509 Corona, 7513 Coronal Mass Ejections, 7519 Flares, 7546 Transition Region
Scientific paper
EIT waves are global waves observed to propagate across quiet coronal field regions in the SOHO/EIT data. The waves are initiated in association with other transient activity. The literature now contains many references to EIT waves and observers have published observations of associated waves at a variety of wavelengths. We show in this poster that there is confusion in the literature as to what an EIT wave is. We use YOHKOH SXT, Nobeyama Radioheliograph and He I 10830A observations to show that the EIT instrument observes waves with two distinct properties and morphologies. These two morphologies correspond to the classical Moreton wave and to what we call the EIT wave. The Moreton waves in EIT appear as a sharp, bright feature, travelling at super-Alfvenic velocities. The EIT waves instead appear as a diffuse, faint feature, moving at relatively slower velocities. The EIT waves appear much more frequently than the Moreton waves and Moreton waves are usually seen in tandem with EIT waves. Both types of waves have been modelled by various researchers as MHD waves.
Biesecker Doug A.
Hudson Hugh S.
Thompson Barbara J.
Warmuth Alexander
White Simon
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