4 Debates

In this section, we discuss some key topics that are still under hot debate.

 4.1 Is magnetic reconnection necessary?
 4.2 Should fast and slow CMEs be attributed to different models?
 4.3 Nature and the driving source of “EIT waves”
  4.3.1 Fast-mode MHD wave model
  4.3.2 Magnetic fieldline successive stretching model
  4.3.3 Successive reconnection model
  4.3.4 Current shell model
  4.3.5 Slow-mode wave or soliton wave model
 4.4 What is the nature of CMEs?
 4.5 Are halo CMEs special?

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