On the field line length dependence of variations in anisotropies for pitch angle distributions of keV electrons at dipolarization sites in the tailside

淡江大學機構典藏 > 工學院 > 航空太空工程學系暨研究所 > 會議論文 > Item 987654321/113662

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题名:	On the field line length dependence of variations in anisotropies for pitch angle distributions of keV electrons at dipolarization sites in the tailside
作者:	Wang, Kaiti;Lang, Zhuo-Ren;Lin, Ching-Huei;Hada, Tohru;Chen, Alfred B. C.;Nishimura, Yukitoshi
关键词:	pitch angle distributions;dipolarization;THEMIS mission
日期:	2018-05-22
上传时间:	2018-06-07 12:12:36 (UTC+8)
摘要:	Previous studies had reported observations from various satellite missions on changes in pitch angle distributions of electrons during dipolarization periods at Earth’s tailside associated with geomagnetic activities. In this study, we quantitatively analyzed the variations in anisotropies for pitch angle distributions of electrons based on observations from 2008 to 2011, by particle instruments ESA and SST onboard the probes of THEMIS mission, at dipolarization sites in the inner plasma sheet. The ratio of this anisotropy during dipolarization to that before dipolarization is found to overall exhibit an increasing trend on its upper limit as the length of field line the probe located increases, specifically for electrons with energies on the order of keV. The effectiveness of Fermi acceleration at different field line length may account for this feature. We will present these results on the aspects of observations as well as theories.
關聯:	PEM16-25, Abstracts of JpGU Meeting 2018
显示于类别:	[航空太空工程學系暨研究所] 會議論文

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