Dawn-dusk asymmetries in the Earth's magnetosheath

被引：59

作者：

Walsh, B. M. ^{[1
]}

Sibeck, D. G. ^{[1
]}

Wang, Y. ^{[1
,2
]}

Fairfield, D. H. ^{[1
]}

机构：

[1] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA

[2] Univ Maryland Baltimore Cty, Catonsville, MD USA

来源：

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS | 2012年 / 117卷

基金：

美国国家科学基金会;

关键词：

INTERPLANETARY MAGNETIC-FIELD; DAYSIDE MAGNETOPAUSE; BOW SHOCK; AMPTE/IRM OBSERVATIONS; GEOTAIL OBSERVATIONS; PLASMA DEPLETION; WIND; FLOW; SHEAR; SHAPE;

D O I：

10.1029/2012JA018240

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Statistical observations by the THEMIS spacecraft show a dawn-dusk asymmetry in plasma parameters within the Earth's magnetosheath. Proton density and temperature are greater on the dawnside while the magnetic field strength and bulk flow are greater on the duskside. The asymmetry has been measured just outside the magnetopause in the dayside magnetosheath through 1114 boundary crossings from 2008 through 2010. These results are compared with modeling from the BATS-R-US global MHD code and are consistent with the expected asymmetries that would result from the interactions of the Parker spiral interplanetary magnetic field with the Earth's bow shock. Solar cycle variations are analyzed for the current and past studies to predict the influence of upstream conditions during different time periods. Citation: Walsh, B. M., D. G. Sibeck, Y. Wang, and D. H. Fairfield (2012), Dawn-dusk asymmetries in the Earth's magnetosheath, J. Geophys. Res., 117, A12211, doi:10.1029/2012JA018240.

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