Near-Earth injection of MeV electrons associated with intense dipolarization electric fields: Van Allen Probes observations

被引:72
作者
Dai, Lei [1 ,2 ]
Wang, Chi [1 ]
Duan, Suping [1 ]
He, Zhaohai [1 ]
Wygant, John R. [2 ]
Cattell, Cynthia A. [2 ]
Tao, Xin [3 ]
Su, Zhenpeng [3 ]
Kletzing, Craig [4 ]
Baker, Daniel N. [5 ]
Li, Xinlin [5 ]
Malaspina, David [5 ]
Blake, J. Bernard [6 ]
Fennell, Joseph [6 ]
Claudepierre, Seth [6 ]
Turner, Drew L. [6 ]
Reeves, Geoffrey D. [7 ]
Funsten, Herbert O. [7 ]
Spence, Harlan E. [8 ]
Angelopoulos, Vassilis [9 ,10 ]
Fruehauff, Dennis [11 ]
Chen, Lunjin [12 ]
Thaller, Scott [2 ]
Breneman, Aaron [2 ]
Tang, Xiangwei [2 ]
机构
[1] Chinese Acad Sci, Natl Space Sci Ctr, State Key Lab Space Weather, Beijing, Peoples R China
[2] Univ Minnesota, Sch Phys & Astron, Minneapolis, MN 55455 USA
[3] Univ Sci & Technol China, Dept Geophys & Planetary Sci, Hefei 230026, Peoples R China
[4] Univ Iowa, Dept Phys & Astron, Iowa City, IA 52242 USA
[5] Univ Colorado, Lab Atmospher & Space Phys, Boulder, CO 80309 USA
[6] Aerosp Corp, Dept Space Sci, Los Angeles, CA 90009 USA
[7] Los Alamos Natl Lab, Los Alamos, NM USA
[8] Univ New Hampshire, Inst Earth Oceans & Space, Dept Phys, Durham, NH 03824 USA
[9] Univ Calif Los Angeles, Dept Earth Planetary & Space Sci, Los Angeles, CA USA
[10] Univ Calif Los Angeles, Inst Geophys & Planetary Phys, Los Angeles, CA 90024 USA
[11] Braunschweig Univ Technol, Inst Geophys & Extraterr Phys, Braunschweig, Germany
[12] Univ Texas Dallas, Dept Phys, Richardson, TX 75083 USA
关键词
substorm injection; substorm dipolarization; radiation belt electrons; electric fields; ENERGETIC PARTICLE INJECTIONS; RADIATION BELT; SUBSTORM INJECTION; RELATIVISTIC ELECTRONS; GEOSYNCHRONOUS ORBIT; INNER MAGNETOSPHERE; MARCH; 24; SIMULATION; ACCELERATION; EVENT;
D O I
10.1002/2015GL064955
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
Substorms generally inject tens to hundreds of keV electrons, but intense substorm electric fields have been shown to inject MeV electrons as well. An intriguing question is whether such MeVelectron injections can populate the outer radiation belt. Here we present observations of a substorm injection of MeV electrons into the inner magnetosphere. In the premidnight sector at L approximate to 5.5, Van Allen Probes (Radiation Belt Storm Probes)-A observed a large dipolarization electric field (50mV/m) over approximate to 40s and a dispersionless injection of electrons up to approximate to 3MeV. Pitch angle observations indicated betatron acceleration of MeV electrons at the dipolarization front. Corresponding signals of MeV electron injection were observed at LANL-GEO, THEMIS-D, and GOES at geosynchronous altitude. Through a series of dipolarizations, the injections increased the MeV electron phase space density by 1 order of magnitude in less than 3h in the outer radiation belt (L > 4.8). Our observations provide evidence that deep injections can supply significant MeV electrons.
引用
收藏
页码:6170 / 6179
页数:10
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