A Short-lived Three-Belt Structure for sub-MeV Electrons in the Van Allen Belts: Time Scale and Energy Dependence

被引：15

作者：

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

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

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

Zou, H. ^{[1
]}

Rankin, R. ^{[2
]}

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

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

Liu, Y. ^{[1
]}

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

Baker, D. N. ^{[3
]}

Spence, H. E. ^{[4
]}

Blake, J. B. ^{[5
]}

Reeves, G. D. ^{[6
,7
]}

Claudepierre, S. G. ^{[5
,8
]}

机构：

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

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

[3] Univ Colorado, Lab Atmospher & Space Phys, Boulder, CO 80309 USA

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

[5] Aerosp Corp, Space Sci Applicat Lab, El Segundo, CA 90245 USA

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

[7] New Mexico Consortium, Los Alamos, NM USA

[8] Univ Calif Los Angeles, Dept Atmospher & Ocean Sci, Los Angeles, CA USA

来源：

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS | 2020年 / 125卷 / 09期

基金：

中国国家自然科学基金; 加拿大自然科学与工程研究理事会;

关键词：

OUTER RADIATION BELT; GEOMAGNETIC STORMS; DYNAMICS; MAGNETOSPHERE; SPECTROMETER; INJECTION; LOSSES;

D O I：

10.1029/2020JA028031

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

In this study we focus on the radiation belt dynamics driven by the geomagnetic storms during September 2017. Besides the long-lasting three-belt structures of ultrarelativistic electrons (>2 MeV, existing for tens of days), which has been studied intensively during the Van Allen Probe era, it is found that magnetospheric electrons of hundreds of keVs can also have three-belt structures at similar L extent during storm time. Measurements of 500-800 keV electrons from MagEIS instrument onboard Van Allen Probes show double-peaked (L = 3.5 and 4.5, respectively) flux-versus-L-shell profile in the outer belt, which lasted for 2-3 days. During the time interval of such transient three-belt structure, the energy-versus-L spectrogram shows novel distributions differing from both "S-shaped" and "V-shaped" spectrograms reported previously. Such peculiar distribution also illustrates the energy-dependent occurrence of the three-belt profile. The gradual formation of "reversed energy spectrum" at L similar to 3.5 also indicates that hiss scattering inside the plasmapause contributed to the fast decay of sub-MeV remnant belt.

引用

页数：13