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Field-Aligned Electrons in Polar Region Observed by Cluster on 30 September 2001

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摘要 The physical process in the Earth's polar region is very complex and still needs to be further studied.Using the data from Cluster satellite measurement,an analysis on field-aligned electrons in the mid-latitude cusp on 30 September 2001 has been performed.The satellite observed a down-flowing electron event in the low-latitude boundary and a sequential up-flowing electron event in the high-latitude boundary of the cusp region.The down-flowing electron had a velocity as high as 500 km/s and a flux of 2.0×10^(9) cm^(-2)-s^(-1).The up-flowing electron had a velocity up to 1200 km/s and a flux of 4.9×10^(9) cm^(-2)-s^(-1).Both the velocity and the flux observed in this event are the maximum values of the up-flowing electrons observed by all satellites to date.The electron is the main contributor for the field-aligned current in this event.The physical mechanism is also discussed.The down-flowing electron in the low-latitude boundary of the cusp region may result from solar wind injecting during the southward IMF,and the up-flowing electrons in the high-latitude boundary of cusp may result from mirroring of the solar wind,or from the ionospheric up-flowing electrons which have been accelerated.
作者 ZHANG Zi-Ying SHI Jian-Kui CHENG Zheng-Wei Andrew Fazakerley 张子迎;史建魁;程征伟;Andrew Fazakerley(State Key Laboratory of Space Weather,National Space Science Center,Chinese Academy of Sciences,Beijing 100190;MSSL,University College London,UK)
出处 《Chinese Physics Letters》 SCIE CAS CSCD 2012年第9期244-247,共4页 中国物理快报(英文版)
基金 Supported by the National Natural Science Foundation of China under Grant Nos 41074114,40804031 and 40921063 the Specialized Research Fund for State Key Laboratory in China.
关键词 LATITUDE EARTH flowing
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