Energetic Electron Precipitation Observed by FIREBIRD-II Potentially Driven by EMIC Waves: Location, Extent, and Energy Range From a Multievent Analysis

被引：40

作者：

Capannolo, L. ^{[1
]}

Li, W. ^{[1
]}

Spence, H. ^{[2
]}

Johnson, A. T. ^{[3
]}

Shumko, M. ^{[4
]}

Sample, J. ^{[3
]}

Klumpar, D. ^{[3
]}

机构：

[1] Boston Univ, Ctr Space Phys, Boston, MA 02215 USA

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

[3] Montana State Univ, Dept Phys, Bozeman, MT 59717 USA

[4] NASA, Goddard Space Flight Ctr, Greenbelt, MD USA

来源：

GEOPHYSICAL RESEARCH LETTERS | 2021年 / 48卷 / 05期

基金：

美国国家科学基金会;

关键词：

electron losses; electron precipitation; EMIC waves; inner magnetosphere; proton precipitation; wave‐ particle interactions;

D O I：

10.1029/2020GL091564

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

We evaluate the location, extent, and energy range of electron precipitation driven by ElectroMagnetic Ion Cyclotron (EMIC) waves using coordinated multisatellite observations from near-equatorial and Low-Earth-Orbit (LEO) missions. Electron precipitation was analyzed using the Focused Investigations of Relativistic Electron Burst Intensity, Range and Dynamics (FIREBIRD-II) CubeSats, in conjunction either with typical EMIC-driven precipitation signatures observed by Polar Orbiting Environmental Satellites (POES) or with in situ EMIC wave observations from Van Allen Probes. The multievent analysis shows that electron precipitation occurred in a broad region near dusk (16-23 MLT), mostly confined to 3.5-7.5 L-shells. Each precipitation event occurred on localized radial scales, on average similar to 0.3 L. Most importantly, FIREBIRD-II recorded electron precipitation from similar to 200 to 300 keV to the expected similar to MeV energies for most cases, suggesting that EMIC waves can efficiently scatter a wide energy range of electrons.

引用

页数：11

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