Energetic electrons associated with magnetic reconnection in the sheath of interplanetary coronal mass ejection |
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Authors: | ShiYong Huang XiaoHua Deng Meng Zhou ZhiGang Yuan HuiMin Li DeDong Wang |
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Institution: | [1]School of Electronic Information, Wuhan University, Wuhan 430072, China [2]State Key Laboratory of Space Weather, Chinese Academy of Sciences, Beijing 100190, China [3]Institute of Space Science and Technology, Nanchang University, Nanchang 330031, China |
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Abstract: | Magnetic reconnection is an important universal plasma dissipation process that converts magnetic energy into plasma thermal and kinetic energy,and simultaneously changes the magnetic field topology.In this paper,we report the first observation of energetic electrons associated with asymmetric reconnection in the sheath of an interplanetary coronal mass ejection.The magnetic field shear angle was about 151°,implying guide-field reconnection.The width of the exhaust was about 8×104 km.The reconnection rate was estimated as 0.044–0.08,which is consistent with fast reconnection theory and previous observations.We observed flux enhancements of energetic electrons with energy up to 400 keV in this reconnection exhaust.The region where ener- getic electron fluxes were enhanced is located at one pair of separatrices in the higher density hemisphere.We discuss these observation results,and compare with previous observations and recent kinetic simulations. |
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Keywords: | energetic electrons magnetic reconnection guide field interplanetary coronal mass ejection |
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