A nonstorm time enhancement of relativistic electrons in the outer radiation belt

被引：48

作者：

Schiller, Quintin ^{[1
,2
]}

Li, Xinlin ^{[1
,2
]}

Blum, Lauren ^{[1
,2
]}

Tu, Weichao ^{[3
]}

Turner, Drew L. ^{[4
]}

Blake, J. B. ^{[5
]}

机构：

[1] Univ Colorado, Dept Aerosp Engn Sci, Boulder, CO 80303 USA

[2] Univ Colorado, Atmospher & Space Phys Lab, Boulder, CO 80303 USA

[3] Los Alamos Natl Lab, ISR 1, Space Sci & Applicat, Los Alamos, NM USA

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

[5] Aerosp Corp, Dept Space Sci, Los Angeles, CA 90009 USA

来源：

GEOPHYSICAL RESEARCH LETTERS | 2014年 / 41卷 / 01期

基金：

美国国家科学基金会;

关键词：

relativistic electrons; outer radiation belt; enhancement; phase space density; internal acceleration; rapid radial transport; VAN-ALLEN RADIATION; SOLAR-WIND; MAGNETIC STORMS; GEOMAGNETIC STORMS; GEOSYNCHRONOUS ORBIT; ENERGETIC PARTICLE; ACCELERATION; MODEL; MAGNETOSPHERE; ENERGIZATION;

D O I：

10.1002/2013GL058485

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

Despite the lack of a geomagnetic storm (based on the Dst index), relativistic electron fluxes were enhanced over 2.5 orders of magnitude in the outer radiation belt in 13h on 13-14 January 2013. The unusual enhancement was observed by Magnetic Electron Ion Spectrometer (MagEIS), onboard the Van Allen Probes; Relativistic Electron and Proton Telescope Integrated Little Experiment, onboard the Colorado Student Space Weather Experiment; and Solid State Telescope, onboard Time History of Events and Macroscale Interactions during Substorms (THEMIS). Analyses of MagEIS phase space density (PSD) profiles show a positive outward radial gradient from 4<L<5.5. However, THEMIS observations show a peak in PSD outside of the Van Allen Probes' apogee, which suggest a very interesting scenario: wave-particle interactions causing a PSD peak at similar to L*=5.5 from where the electrons are then rapidly transported radially inward. This letter demonstrates, for the first time in detail, that geomagnetic storms are not necessary for causing dramatic enhancements in the outer radiation belt.

引用

页码：7 / 12

页数：6

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