globalchange  > 科学计划与规划
DOI: 10.1002/2016GL069691
论文题名:
Energy limits of electron acceleration in the plasma sheet during substorms: A case study with the Magnetospheric Multiscale (MMS) mission
作者: Turner D.L.; Fennell J.F.; Blake J.B.; Clemmons J.H.; Mauk B.H.; Cohen I.J.; Jaynes A.N.; Craft J.V.; Wilder F.D.; Baker D.N.; Reeves G.D.; Gershman D.J.; Avanov L.A.; Dorelli J.C.; Giles B.L.; Pollock C.J.; Schmid D.; Nakamura R.; Strangeway R.J.; Russell C.T.; Artemyev A.V.; Runov A.; Angelopoulos V.; Spence H.E.; Torbert R.B.; Burch J.L.
刊名: Geophysical Research Letters
ISSN: 0094-8802
EISSN: 1944-8533
出版年: 2016
卷: 43, 期:15
起始页码: 7785
结束页码: 7794
语种: 英语
英文关键词: energetic particle injections ; magnetotail ; particle acceleration ; plasma sheet ; reconnection ; substorm
Scopus关键词: Magnetosphere ; NASA ; Particle injectors ; Plasma accelerators ; Plasma sheaths ; Precipitation (chemical) ; Energetic particle injections ; Magnetotails ; Particle acceleration ; Plasma sheet ; reconnection ; Substorms ; Electrons
英文摘要: We present multipoint observations of earthward moving dipolarization fronts and energetic particle injections from NASA's Magnetospheric Multiscale mission with a focus on electron acceleration. From a case study during a substorm on 02 August 2015, we find that electrons are only accelerated over a finite energy range, from a lower energy threshold at ~7–9 keV up to an upper energy cutoff in the hundreds of keV range. At energies lower than the threshold energy, electron fluxes decrease, potentially due to precipitation by strong parallel electrostatic wavefields or initial sources in the lobes. Electrons at energies higher than the threshold are accelerated cumulatively by a series of impulsive magnetic dipolarization events. This case demonstrates how the upper energy cutoff increases, in this case from ~130 keV to >500 keV, with each dipolarization/injection during sustained activity. We also present a simple model accounting for these energy limits that reveals that electron energization is dominated by betatron acceleration. ©2016. The Authors.
URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84983472658&doi=10.1002%2f2016GL069691&partnerID=40&md5=8574dee997867cf295b332caa31ac356
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被引频次[WOS]:52   [查看WOS记录]     [查看WOS中相关记录]
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/9765
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: Space Sciences Department, The Aerospace Corporation, El Segundo, CA, United States

Recommended Citation:
Turner D.L.,Fennell J.F.,Blake J.B.,et al. Energy limits of electron acceleration in the plasma sheet during substorms: A case study with the Magnetospheric Multiscale (MMS) mission[J]. Geophysical Research Letters,2016-01-01,43(15).
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