Substorm time ionospheric field-aligned currents as observed by CHAMP

被引：3

作者：

Wang Hui ^{[1
,2
]}

Mao Dan-Dan ^{[1
]}

Ma Shu-Ying ^{[1
]}

Luehr, H. ^{[3
]}

机构：

[1] Wuhan Univ, Sch Elect Informat, Dept Space Phys, Wuhan 430079, Peoples R China

[2] Chinese Acad Sci, State Key Lab Space Weather, Beijing 100190, Peoples R China

[3] German Res Ctr Geosci, Helmholtz Ctr Potsdam GFZ, D-14473 Potsdam, Germany

来源：

CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION | 2010年 / 53卷 / 06期

关键词：

Substorm; Polar ionosphere; Field-aligned current; CHAMP; ONSET;

D O I：

10.3969/j.issn.0001-5733.2010.06.002

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

Field-aligned currents (FACs) play an important role in the energy, momentum, and mass coupling between magnetosphere and ionosphere. This study investigates the statistical characteristics of polar ionospheric FACs during substorms by using high resolution magnetic field measurements on board CHAMP. Obvious day-night and dusk-dawn asymmetries emerge in both FACs density and location. It shows: (1) FACs densities are related to AL index, with larger AL the larger current density. FACs densities during substorm are 5 times of that during quiet period. The duskside and nightside FACs densities correlate well with AL, while the dawnside and dayside FACs densities correlate not well with AL; (2) the locations of peak FACs densities do not correlate with AL. The dusk FACs locate equatorward of the dawn, and the nightside FACs locate equatorward of the dayside.

引用

页码：1256 / 1262

页数：7

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