Observations of energetic particle escape at themagnetopause: Early results from the MMS Energetic Ion Spectrometer (EIS)

被引：22

作者：

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

Mauk, B. H. ^{[1
]}

Anderson, B. J. ^{[1
]}

Westlake, J. H. ^{[1
]}

Sibeck, D. G. ^{[2
]}

Giles, B. L. ^{[2
]}

Pollock, C. J. ^{[2
,3
]}

Turner, D. L. ^{[4
]}

Fennell, J. F. ^{[4
]}

Blake, J. B. ^{[4
]}

Clemmons, J. H. ^{[4
]}

Jaynes, A. N. ^{[5
]}

Baker, D. N. ^{[5
]}

Craft, J. V. ^{[5
]}

Spence, H. E. ^{[6
]}

Niehof, J. T. ^{[6
]}

Reeves, G. D. ^{[7
]}

Torbert, R. B. ^{[6
]}

Russell, C. T. ^{[8
]}

Strangeway, R. J. ^{[8
]}

Magnes, W. ^{[9
]}

Trattner, K. J. ^{[5
]}

Fuselier, S. A. ^{[10
,11
]}

Burch, J. L. ^{[10
]}

机构：

[1] Johns Hopkins Univ, Appl Phys Lab, Laurel, MD 20723 USA

[2] NASA, Goddard Space Flight Ctr, Greenbelt, MD USA

[3] Denali Sci, Healy, AK USA

[4] Aerosp Corp, El Segundo, CA USA

[5] Univ Colorado, LASP, Boulder, CO 80309 USA

[6] Univ New Hampshire, Ctr Space Sci, Durham, NH 03824 USA

[7] Los Alamos Natl Lab, Los Alamos, NM USA

[8] Univ Calif Los Angeles, Los Angeles, CA USA

[9] Austrian Acad Sci, Space Res Inst, Graz, Austria

[10] Southwest Res Inst, San Antonio, TX USA

[11] Univ Texas San Antonio, Dept Phys & Astron, San Antonio, TX USA

来源：

GEOPHYSICAL RESEARCH LETTERS | 2016年 / 43卷 / 12期

关键词：

FIELD LINE TOPOLOGY; EARTHS MAGNETOPAUSE; BOUNDARY-LAYER; SUBSOLAR MAGNETOPAUSE; DAYSIDE MAGNETOPAUSE; MAGNETOSPHERIC IONS; MAGNETOSHEATH; RECONNECTION; PLASMA; DISTRIBUTIONS;

D O I：

10.1002/2016GL068689

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

Energetic (greater than tens of keV) magnetospheric particle escape into the magnetosheath occurs commonly, irrespective of conditions that engender reconnection and boundary-normal magnetic fields. A signature observed by the Magnetospheric Multiscale (MMS) mission, simultaneous monohemispheric streaming of multiple species (electrons, H+, Hen+), is reported here as unexpectedly common in the dayside, dusk quadrant of the magnetosheath even though that region is thought to be drift-shadowed from energetic electrons. This signature is sometimes part of a pitch angle distribution evolving from symmetric in the magnetosphere, to asymmetric approaching the magnetopause, to monohemispheric streaming in the magnetosheath. While monohemispheric streaming in the magnetosheath may be possible without a boundary-normal magnetic field, the additional pitch angle depletion, particularly of electrons, on the magnetospheric side requires one. Observations of this signature in the dayside dusk sector imply that the static picture of magnetospheric drift-shadowing is inappropriate for energetic particle dynamics in the outer magnetosphere.

引用

页码：5960 / 5968

页数：9

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