Relativistic electron dynamics produced by azimuthally localized poloidalmode ULF waves: Boomerang-shaped pitch angle evolutions

被引：52

作者：

Hao, Y. X. ^{[1
]}

Zong, Q. -G. ^{[1
]}

Zhou, X. -Z. ^{[1
]}

Rankin, R. ^{[2
]}

Chen, X. R. ^{[1
]}

Liu, Y. ^{[1
]}

Fu, S. Y. ^{[1
]}

Spence, H. E. ^{[3
]}

Blake, J. B.

Reeves, G. D. ^{[4
]}

机构：

[1] Peking Univ, Inst Space Phys & Appl Technol, Beijing, Peoples R China

[2] Univ Alberta, Dept Phys, Edmonton, AB, Canada

[3] Univ New Hampshire, Dept Phys, Inst Earth Oceans & Space, Durham, NH 03824 USA

[4] Los Alamos Natl Lab, Los Alamos, NM USA

来源：

GEOPHYSICAL RESEARCH LETTERS | 2017年 / 44卷 / 15期

基金：

中国国家自然科学基金;

关键词：

CHARGED-PARTICLE BEHAVIOR; ALLEN PROBES OBSERVATIONS; FREQUENCY GEOMAGNETIC-PULSATIONS; FIELD;

D O I：

10.1002/2017GL074006

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

We present an analysis of "boomerang-shaped" pitch angle evolutions of outer radiation belt relativistic electrons observed by the Van Allen Probes after the passage of an interplanetary shock on 7 June 2014. The flux at different pitch angles is modulated by Pc5 waves, with equatorially mirroring electrons reaching the satellite first. For 90 degrees pitch angle electrons, the phase change of the flux modulations across energy exceeds 180 degrees and increasingly tilts with time. Using estimates of the arrival time of particles of different pitch angles at the spacecraft location, a scenario is investigated in which shock-induced ULF waves interact with electrons through the drift resonance mechanism in a localized region westward of the spacecraft. Numerical calculations on particle energy gain with the modified ULF wavefield reproduce the observed boomerang stripes and modulations in the electron energy spectrogram. The study of boomerang stripes and their relationship to drift resonance taking place at a location different from the observation point adds new understanding of the processes controlling the dynamics of the outer radiation belt.

引用

页码：7618 / 7627

页数：10

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