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Abstract: Coronal mass ejections CMEs originate from closed magnetic field regions onthe Sun, which are active regions and quiescent filament regions. The energeticpopulations such as halo CMEs, CMEs associated with magnetic clouds,geoeffective CMEs, CMEs associated with solar energetic particles andinterplanetary type II radio bursts, and shock-driving CMEs have been found tooriginate from sunspot regions. The CME and flare occurrence rates are found tobe correlated with the sunspot number, but the correlations are significantlyweaker during the maximum phase compared to the rise and declining phases. Wesuggest that the weaker correlation results from high-latitude CMEs from thepolar crown filament regions that are not related to sunspots.



Author: N. Gopalswamy, S. Akiyama, S. Yashiro, P. Makela

Source: https://arxiv.org/







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