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| Paper: |
Initiation of CMEs: EIT Waves and EUV Dimmings |
| Volume: |
325, The Solar-B Mission and the Forefront of Solar Physics |
| Page: |
381 |
| Authors: |
Zhukov, A.N. |
| Abstract: |
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 Solar-B mission are discussed. |
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