| Why are halo coronal mass ejections faster? |
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| 作者单位： | Qing-Min Zhang,Yang Guo(Department of Astronomy,Nanjing University,Nanjing 210093,China);Peng-Fei Chen,Ming-De Ding,Cheng Fang(Department of Astronomy,Nanjing University,Nanjing 210093,China;Key Laboratory of Modern Astronomy and Astrophysics,Ministry of Education,Nanjing210093,China) |
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| 基金项目： | the Chinese foundations，the National Natural Science Foundation of China，international cooperation between ESA and NASA |
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| 摘 要： | Halo coronal mass ejections (CMEs) have been to be significantly faster than normal CMEs, which is a long-standing puzzle. In order to solve the puzzle, we first investigate the observed properties of 31 limb CMEs that clearly display loopshaped frontal loops. The observational results show a strong tendency that slower CMEs are weaker in white-light intensity. Then, we perform a Monte Carlo simulation of 20000 artificial limb CMEs that have an average velocity of ～523km s -1. The Thomson scattering of thes...
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| 关 键 词： | Sun: coronal mass ejections (CMEs) — Sun: activity — methods: nu-merical — solar-terrestrial relations |
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