Initiation of CMEs: EIT Waves and EUV Dimmings

Details Initiation of CMEs: EIT Waves and EUV Dimmings Initiation of CMEs: EIT Waves and EUV Dimmings

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aspc..325..381z&link_type=abstract

The Solar-B Mission and the Forefront of Solar Physics, ASP Conference Series, Vol. 325, Proceedings of the Fifth Solar-B Scienc

Physics

3

Scientific paper

A review of EIT waves and extreme-ultraviolet (EUV) dimmings is presented. These phenomena are important signatures of Coronal Mass Ejections (CMEs). The morphologies of EIT waves/EUV dimmings observed in different spectral bandpasses are described and their basic properties are summarized. EIT wave is a coronal phenomenon and invisible in the transition region plasma (except perhaps lower transition region). EUV dimmings represent the regions with density depleted due to the removal of mass during the CME. EIT waves can be regarded as a bimodal phenomenon. The wave mode represents a wave-like propagating disturbance. The eruptive mode is a propagation of a dimming and an EIT wave as a result of successive opening of magnetic field lines during the CME lifting. It is shown that at present it is difficult to reconcile all the observational facts into a coherent physical model. In particular, the physical nature of the wave mode of EIT waves remains elusive. Some implications for the SolarB mission are discussed.

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