Spatial profile of magnetic field in the near-Earth plasma sheet prior to dipolarization by THEMIS: Feature of minimum B

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题名:	Spatial profile of magnetic field in the near-Earth plasma sheet prior to dipolarization by THEMIS: Feature of minimum B
作者:	Saito,MH;Hau,LN;Hung,CC;Lai,YT;Chou,YC
贡献者:	太空科學研究所
关键词:	SELF-CONSISTENT THEORY;CONVECTION;MAGNETOTAIL;STATE;CONFIGURATION;PRESSURE;MODES;TAIL
日期:	2010
上传时间:	2012-03-27 17:31:04 (UTC+8)
出版者:	國立中央大學
摘要:	We present THEMIS observations of the near-Earth plasma sheet that permit us to assess the geometrical structure of the magnetotail prior to dipolarization. Latitudinal profiles of the magnetic field were obtained by five spacecraft simultaneously around the magnetic equator at a distance of X(GSM) similar to-10(RE) in the premidnight for two events. It is found that the strength of normal magnetic field B(z) was increased with a distance from the magnetic equator, which differs considerably from the standard magnetic field model. Instead, the observation can be explained by a magnetic field model that has a minimum in the equatorial field strength (minimum B), as required from the force-balanced magnetotail model with steady earthward convection. Moreover, the analyses showed that the feature of minimum B sustained continuously for similar to 20 min before dipolarization onsets. Citation: Saito, M. H., L.- N. Hau, C.-C. Hung, Y.- T. Lai, and Y.-C. Chou (2010), Spatial profile of magnetic field in the near-Earth plasma sheet prior to dipolarization by THEMIS: Feature of minimum B, Geophys. Res. Lett., 37, L08106, doi:10.1029/2010GL042813.
關聯:	GEOPHYSICAL RESEARCH LETTERS
显示于类别:	[太空科學研究所 ] 期刊論文

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