Analysis on anisotropy variations for pitch angle distributions of electrons with various parameters at dipolarization sites in the inner plasma sheet
學年 107
學期 2
發表日期 2019-05-26
作品名稱 Analysis on anisotropy variations for pitch angle distributions of electrons with various parameters at dipolarization sites in the inner plasma sheet
作品名稱（其他語言）
著者 Kaiti Wang; Zhuo-Ren Lang; Ching-Huei Lin; Tohru Hada; Toshi Nishimura
作品所屬單位
出版者
會議名稱 Japan Geoscience Union Meeting 2019
會議地點 千葉, 日本
摘要 During geomagnetic activities, dipolarization of geomagnetic fields can been found to occur at tailside. In this study, we investigate variations in anisotropies of pitch angle distributions for electrons at 63 observed dipolarization sites around distance of 10 RE (Earth radii) near the magnetic equator in the inner plasma sheet when auroral electrojet AL index decreases. Observational data from 2008 to 2011 for electrons below ~26 keV from the instrument ESA (ElectroStatic Analyzer) onboard of THEMIS mission are adopted. Followed from our previous presentation in which the dependence of these variations on field line lengths (FLL) was focused on [Wang et al., 2018], we present new analysis results concentrating on the dependence of the changes as well as the rates of changes in FLL, magnetic field strengths, and dipolarization angles, during a dipolarizaion period. Comparisons between the anisotropy variations in pitch angle distributions of electrons and the associated bounce time of electrons, event dipolarization time, and measured environmental electric fields will also be presented and discussed. References Wang, K., Z. R. Lang, C. H. Lin, T. Hada, A. B. C. Chen, Y. Nishimura (2018). On the field line length dependence of variations in anisotropies for pitch angle distributions of keV electrons at dipolarization sites in the tailside. PEM16-25, JpGU Meeting 2018, Chiba, Japan.
關鍵字 dipolarization;anisotropy of pitch angle distributions of electrons;observations of THEMIS mission
語言 en
收錄於
會議性質 國際
校內研討會地點 無
研討會時間 20190526~20190530
通訊作者 Kaiti Wang; Zhuo-Ren Lang; Ching-Huei Lin; Tohru Hada; Toshi Nishimura
國別 JPN
公開徵稿
出版型式
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