THEMIS observations of extreme magnetopause motion caused by a hot flow anomaly

被引：70

作者：

Jacobsen, K. S. ^{[1
]}

Phan, T. D. ^{[2
]}

Eastwood, J. P. ^{[2
]}

Sibeck, D. G. ^{[3
]}

Moen, J. I. ^{[1
]}

Angelopoulos, V. ^{[4
]}

McFadden, J. P. ^{[2
]}

Engebretson, M. J. ^{[6
]}

Provan, G. ^{[5
]}

Larson, D. ^{[2
]}

Fornacon, K. -H. ^{[7
]}

机构：

[1] Univ Oslo, Dept Phys, N-0316 Oslo, Norway

[2] Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA

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

[4] Univ Calif Los Angeles, ESS, IGPP, Los Angeles, CA 90095 USA

[5] Univ Leicester, Dept Phys & Astron, Leicester LE1 7RH, Leics, England

[6] Augsburg Coll, Dept Phys, Minneapolis, MN USA

[7] Tech Univ Carolo Wilhelmina Braunschweig, IGEP, D-38106 Braunschweig, Germany

来源：

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS | 2009年 / 114卷

基金：

美国国家科学基金会;

关键词：

EARTHS BOW SHOCK; DAYSIDE MAGNETOPAUSE; SOLAR-WIND; UNUSUAL LOCATIONS; MAGNETIC SHEAR; CURRENT LAYER; CURRENT SHEET; CONVECTION; THICKNESS; MAGNETOSPHERE;

D O I：

10.1029/2008JA013873

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

On 30 October 2007, the five THEMIS spacecraft observed the cause and consequence of extreme motion of the dawn flank magnetopause, displacing the magnetopause outward by at least 4.8 RE in 59 s, with flow speeds in the direction normal to the model magnetopause reaching 800 km/s. While the THEMIS A, C, D, and E observations allowed the determination of the velocity, size, and shape of a large bulge moving tailward along the magnetopause at a speed of 355 km/s, THEMIS B observed the signatures of a hot flow anomaly (HFA) upstream of the bow shock at the same time, indicating that the pressure perturbation generated by the HFA may be the source of the fast compression and expansion of the magnetosphere. The transient deformation of the magnetopause generated field-aligned currents and created traveling convection vortices which were detected by ground magnetometers. This event demonstrates that kinetic (non-MHD) effects at the bow shock can have global consequences on the magnetosphere.

引用

页数：10

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