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DOI: 10.1002/2015GL064955
论文题名:
Near-Earth injection of MeV electrons associated with intense dipolarization electric fields: Van Allen Probes observations
作者: Dai L.; Wang C.; Duan S.; He Z.; Wygant J.R.; Cattell C.A.; Tao X.; Su Z.; Kletzing C.; Baker D.N.; Li X.; Malaspina D.; Blake J.B.; Fennell J.; Claudepierre S.; Turner D.L.; Reeves G.D.; Funsten H.O.; Spence H.E.; Angelopoulos V.; Fruehauff D.; Chen L.; Thaller S.; Breneman A.; Tang X.
刊名: Geophysical Research Letters
ISSN: 0094-8604
EISSN: 1944-8335
出版年: 2015
卷: 42, 期:15
起始页码: 6170
结束页码: 6179
语种: 英语
英文关键词: electric fields ; radiation belt electrons ; substorm dipolarization ; substorm injection
Scopus关键词: Electric fields ; Magnetosphere ; Orbits ; Phase space methods ; Probes ; Radiation belts ; Dipolarization ; Dispersionless injections ; Inner magnetosphere ; Intriguing questions ; Outer radiation belt ; Phase space densities ; Radiation belt electrons ; Substorm injections ; Electrons ; electron ; geoelectric field ; geomagnetic storm ; magnetosphere ; observational method ; polarization
英文摘要: 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 ∼ 5.5, Van Allen Probes (Radiation Belt Storm Probes)-A observed a large dipolarization electric field (50 mV/m) over ∼40 s and a dispersionless injection of electrons up to ∼3 MeV. 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 3 h in the outer radiation belt (L > 4.8). Our observations provide evidence that deep injections can supply significant MeV electrons. ©2015. The Authors.
URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84940451990&doi=10.1002%2f2015GL064955&partnerID=40&md5=aa91d825f74ac2d4459a91641decaffb
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8220
Appears in Collections:科学计划与规划
气候变化与战略

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作者单位: State Key Laboratory of Space Weather, National Space Science Center, Chinese Academy of Sciences, Beijing, China

Recommended Citation:
Dai L.,Wang C.,Duan S.,et al. Near-Earth injection of MeV electrons associated with intense dipolarization electric fields: Van Allen Probes observations[J]. Geophysical Research Letters,2015-01-01,42(15).
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