Electron dynamics in a subproton-gyroscale magnetic hole

被引：63

作者：

Gershman, Daniel J. ^{[1
,2
]}

Dorelli, John C. ^{[2
]}

Vinas, Adolfo F. ^{[2
]}

Avanov, Levon A. ^{[1
,2
]}

Gliese, Ulrik ^{[2
,3
]}

Barrie, Alexander C. ^{[2
,4
]}

Coffey, Victoria ^{[5
]}

Chandler, Michael ^{[5
]}

Dickson, Charles ^{[2
]}

MacDonald, Elizabeth A. ^{[2
]}

Salo, Chad ^{[2
]}

Holland, Matthew ^{[2
]}

Saito, Yoshifumi ^{[6
]}

Sauvaud, Jean-Andre ^{[7
,8
]}

Lavraud, Benoit ^{[7
,8
]}

Paterson, William R. ^{[2
]}

Torbert, Roy ^{[9
,10
]}

Chen, Li-Jen ^{[2
]}

Goodrich, Katherine ^{[11
]}

Russell, Christopher T. ^{[12
]}

Strangeway, Robert J. ^{[12
]}

Giles, Barbara L. ^{[2
]}

Pollock, Craig J. ^{[2
]}

Moore, Thomas E. ^{[2
]}

Burch, James L. ^{[13
]}

机构：

[1] Univ Maryland, Dept Astron, College Pk, MD 20742 USA

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

[3] SGT Inc, Greenbelt, MD USA

[4] Millenium Engn & Integrat Co, Arlington, VA USA

[5] NASA, George C Marshall Space Flight Ctr, Huntsville, AL 35812 USA

[6] JAXA Inst Space & Astronaut Sci, Sagamihara, Kanagawa, Japan

[7] Univ Toulouse, Inst Rech Astrophys & Planetol, Toulouse, France

[8] CNRS, UMR 5277, Toulouse, France

[9] Univ New Hampshire, Dept Phys, Durham, NH 03824 USA

[10] SW Res Inst, Durham, NH USA

[11] Univ Colorado, Astrophys & Planetary Sci, Boulder, CO 80309 USA

[12] Univ Calif Los Angeles, Dept Earth Planetary & Space Sci, Los Angeles, CA USA

[13] SW Res Inst, San Antonio, TX USA

来源：

GEOPHYSICAL RESEARCH LETTERS | 2016年 / 43卷 / 09期

关键词：

MIRROR INSTABILITY; GENERATION; CLUSTER; WAVES;

D O I：

10.1002/2016GL068545

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

Magnetic holes are ubiquitous in space plasmas, occurring in the solar wind, downstream of planetary bow shocks, and inside the magnetosphere. Recently, kinetic-scale magnetic holes have been observed near Earth's central plasma sheet. The Fast Plasma Investigation on NASA's Magnetospheric Multiscale (MMS) mission enables measurement of both ions and electrons with 2 orders of magnitude increased temporal resolution over previous magnetospheric instruments. Here we present data from MMS taken in Earth's nightside plasma sheet and use high-resolution particle and magnetometer data to characterize the structure of a subproton-scale magnetic hole. Electrons with gyroradii above the thermal gyroradius but below the current layer thickness carry a current sufficient to account for a similar to 10-20% depression in magnetic field magnitude. These observations suggest that the size and magnetic depth of kinetic-scale magnetic holes is strongly dependent on the background plasma conditions.

引用

页码：4112 / 4118

页数：7

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