Interplanetary Coronal Mass Ejections During Solar Cycles 23 and 24: Sun–Earth Propagation Characteristics and Consequences at the Near-Earth Region
Solar Physics(2019)
摘要
In this article, we present a statistical study probing the relation between interplanetary coronal mass ejections (ICMEs) observed at 1 AU and their corresponding coronal mass ejections at the near-Sun region. The work encompasses the ICME activity that occurred during Solar Cycles 23 and 24 (1996 – 2017) while presenting an overall picture of ICME events during the complete Solar Cycle 24 for the first time. The importance of this study further lies in comparing two subsets of ICMEs, i.e. magnetic clouds (MCs) and ejecta (EJ), to explore how the observed structures of ICMEs at 1 AU could be associated with the properties of CMEs during their launch at the Sun. We find that, although Solar Cycle 24 saw a significant reduction in the number of ICME events compared to the previous cycle, the fraction of MCs was much higher during Cycle 24 than Cycle 23 (60
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关键词
Coronal mass ejections,Interplanetary coronal mass ejections,Magnetic clouds,Ejecta
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