Gradual diffusion and punctuated phase space density enhancements of highly relativistic electrons: Van Allen Probes observations

被引：136

作者：

Baker, D. N. ^{[1
]}

Jaynes, A. N. ^{[1
]}

Li, X. ^{[1
]}

Henderson, M. G. ^{[2
]}

Kanekal, S. G. ^{[3
]}

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

Spence, H. E. ^{[4
]}

Claudepierre, S. G. ^{[5
]}

Fennell, J. F. ^{[5
]}

Hudson, M. K. ^{[6
]}

Thorne, R. M. ^{[7
]}

Foster, J. C. ^{[8
]}

Erickson, P. J. ^{[8
]}

Malaspina, D. M. ^{[1
]}

Wygant, J. R. ^{[9
]}

Boyd, A. ^{[4
]}

Kletzing, C. A. ^{[10
]}

Drozdov, A. ^{[11
]}

Shprits, Y. Y. ^{[11
,12
,13
]}

机构：

[1] Univ Colorado, Atmospher & Space Phys Lab, Campus Box 392, Boulder, CO 80309 USA

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

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

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

[5] Aerosp Corp, Dept Space Sci, El Segundo, CA 90245 USA

[6] Dartmouth Coll, Dept Phys & Astron, Hanover, NH 03755 USA

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

[8] MIT, Haystack Observ, Westford, MA 01886 USA

[9] Univ Minnesota, Dept Phys & Astron, Minneapolis, MN 55455 USA

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

[11] Univ Calif Los Angeles, Dept Earth Space Sci, Los Angeles, CA USA

[12] MIT, Dept Earth Atmospher & Planetary Sci, Cambridge, MA USA

[13] Skolkovo Inst Sci & Technol, Skolkovo, Russia

来源：

GEOPHYSICAL RESEARCH LETTERS | 2014年 / 41卷 / 05期

关键词：

radiation belt acceleration; RADIATION-BELT ELECTRONS; GEOMAGNETIC STORMS; MAGNETOSPHERE; ACCELERATION; RING;

D O I：

10.1002/2013GL058942

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

The dual-spacecraft Van Allen Probes mission has provided a new window into mega electron volt (MeV) particle dynamics in the Earth's radiation belts. Observations (up to E similar to 10MeV) show clearly the behavior of the outer electron radiation belt at different timescales: months-long periods of gradual inward radial diffusive transport and weak loss being punctuated by dramatic flux changes driven by strong solar wind transient events. We present analysis of multi-MeV electron flux and phase space density (PSD) changes during March 2013 in the context of the first year of Van Allen Probes operation. This March period demonstrates the classic signatures both of inward radial diffusive energization and abrupt localized acceleration deep within the outer Van Allen zone (L similar to 4.00.5). This reveals graphically that both competing mechanisms of multi-MeV electron energization are at play in the radiation belts, often acting almost concurrently or at least in rapid succession.

引用

页码：1351 / 1358

页数：8

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