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Near-Earth injection of MeV electrons associated with intense dipolarization electric fields: Van Allen Probes observations
Dai, Lei; Wang, Chi; Duan, Suping; He, Zhaohai; Wygant, John R.; Cattell, Cynthia A.; Tao, Xin; Su, Zhenpeng; Kletzing, Craig; Baker, Daniel N.; Li, Xinlin; Malaspina, David; Blake, J. Bernard; Fennell, Joseph; Claudepierre, Seth; Turner, Drew L.; Reeves, Geoffrey D.; Funsten, Herbert O.; Spence, Harlan E.; Angelopoulos, Vassilis; Fruehauff, Dennis; Chen, Lunjin; Thaller, Scott; Breneman, Aaron; Tang, Xiangwei; Dai, L (reprint author), Chinese Acad Sci, Natl Space Sci Ctr, State Key Lab Space Weather, Beijing, Peoples R China.
Department空间科学部
Source PublicationGEOPHYSICAL RESEARCH LETTERS
2015
Volume42Issue:15Pages:6170-6179
ISSN0094-8276
Language英语
KeywordSubstorm Injection Substorm Dipolarization Radiation Belt Electrons Electric Fields
AbstractSubstorms 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.
Indexed BySCI ; EI
Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/4564
Collection空间科学部
Corresponding AuthorDai, L (reprint author), Chinese Acad Sci, Natl Space Sci Ctr, State Key Lab Space Weather, Beijing, Peoples R China.
Recommended Citation
GB/T 7714
Dai, Lei,Wang, Chi,Duan, Suping,et al. Near-Earth injection of MeV electrons associated with intense dipolarization electric fields: Van Allen Probes observations[J]. GEOPHYSICAL RESEARCH LETTERS,2015,42(15):6170-6179.
APA Dai, Lei.,Wang, Chi.,Duan, Suping.,He, Zhaohai.,Wygant, John R..,...&Dai, L .(2015).Near-Earth injection of MeV electrons associated with intense dipolarization electric fields: Van Allen Probes observations.GEOPHYSICAL RESEARCH LETTERS,42(15),6170-6179.
MLA Dai, Lei,et al."Near-Earth injection of MeV electrons associated with intense dipolarization electric fields: Van Allen Probes observations".GEOPHYSICAL RESEARCH LETTERS 42.15(2015):6170-6179.
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