Understanding the Driver of Energetic Electron Precipitation Using Coordinated Multisatellite Measurements

被引：35

作者：

Capannolo, L. ^{[1
]}

Li, W. ^{[1
]}

Ma, Q. ^{[1
,2
]}

Zhang, X. -J. ^{[2
,3
]}

Redmon, R. J. ^{[4
]}

Rodriguez, J. V. ^{[4
]}

Kletzing, C. A. ^{[5
]}

Kurth, W. S. ^{[5
]}

Hospodarsky, G. B. ^{[5
]}

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

Spence, H. E. ^{[7
]}

Reeves, G. D. ^{[8
]}

机构：

[1] Boston Univ, Ctr Space Phys, Boston, MA 02215 USA

[2] Univ Calif Los Angeles, Dept Atmospher & Ocean Sci, Los Angeles, CA USA

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

[4] NOAA, Natl Ctr Environm Informat, Boulder, CO USA

[5] Univ Iowa, Dept Phys & Astron, Iowa City, IA 52242 USA

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

[7] Univ New Hampshire, Inst Study Earth Oceans & Space, Durham, NH 03824 USA

[8] Los Alamos Natl Lab, Space Sci & Applicat Grp, Los Alamos, NM USA

来源：

GEOPHYSICAL RESEARCH LETTERS | 2018年 / 45卷 / 14期

基金：

美国国家科学基金会;

关键词：

radiation belts; energetic particle precipitation; EMIC waves; wave particle interactions; pitch angle scattering; ION-CYCLOTRON WAVES; PITCH-ANGLE DIFFUSION; MULTIBAND EMIC WAVES; RELATIVISTIC ELECTRONS; GEOMAGNETIC STORMS; RESONANT SCATTERING; INNER MAGNETOSPHERE; BELT; ACCELERATION; PARTICLE;

D O I：

10.1029/2018GL078604

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

Magnetospheric plasma waves play a significant role in ring current and radiation belt dynamics, leading to pitch angle scattering loss and/or stochastic acceleration of the particles. During a non-storm time dropout event on 24 September 2013, intense electromagnetic ion cyclotron (EMIC) waves were detected by Van Allen Probe A (Radiation Belt Storm Probes-A). We quantitatively analyze a conjunction event when Van Allen Probe A was located approximately along the same magnetic field line as MetOp-01, which detected simultaneous precipitation of >30 keV protons and energetic electrons over an unexpectedly broad energy range (>similar to 30keV). Multipoint observations together with quasi-linear theory provide direct evidence that the observed electron precipitation at higher energy (>similar to 700keV) is primarily driven by EMIC waves. However, the newly observed feature of the simultaneous electron precipitation extending down to similar to 30keV is not supported by existing theories and raises an interesting question on whether EMIC waves can scatter such low-energy electrons.

引用

页码：6755 / 6765

页数：11

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