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Storm Time Evolution of Outer Radiation Belt Relativistic Electrons by a Nearly Continuous Distribution of Chorus
Author(s) -
Yang Chang,
Xiao Fuliang,
He Yihua,
Liu Si,
Zhou Qinghua,
Guo Mingyue,
Zhao Wanli
Publication year - 2018
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1002/2017gl075894
Subject(s) - van allen radiation belt , physics , chorus , van allen probes , electron , pitch angle , flux (metallurgy) , computational physics , diffusion , oblique case , orbit (dynamics) , range (aeronautics) , geomagnetic storm , geophysics , magnetosphere , magnetic field , nuclear physics , quantum mechanics , earth's magnetic field , art , linguistics , materials science , literature , philosophy , engineering , metallurgy , aerospace engineering , composite material
During the 13–14 November 2012 storm, Van Allen Probe A simultaneously observed a 10 h period of enhanced chorus (including quasi‐parallel and oblique propagation components) and relativistic electron fluxes over a broad range of L = 3–6 and magnetic local time = 2–10 within a complete orbit cycle. By adopting a Gaussian fit to the observed wave spectra, we obtain the wave parameters and calculate the bounce‐averaged diffusion coefficients. We solve the Fokker‐Planck diffusion equation to simulate flux evolutions of relativistic (1.8–4.2 MeV) electrons during two intervals when Probe A passed the location L = 4.3 along its orbit. The simulating results show that chorus with combined quasi‐parallel and oblique components can produce a more pronounced flux enhancement in the pitch angle range ∼45°–80°, consistent well with the observation. The current results provide the first evidence on how relativistic electron fluxes vary under the drive of almost continuously distributed chorus with both quasi‐parallel and oblique components within a complete orbit of Van Allen Probe.