Storm-time evolution of outer radiation belt relativistic electrons by a nearly continuous distribution of chorus

TitleStorm-time evolution of outer radiation belt relativistic electrons by a nearly continuous distribution of chorus
Publication TypeJournal Article
Year of Publication2018
AuthorsYang, C, Xiao, F, He, Y, Liu, S, Zhou, Q, Guo, M, Zhao, W
JournalGeophysical Research Letters
Date Published02/2018
Keywordsenergetic electron; Geomagnetic storm; outer radiation belt; Van Allen Probes; wave-particle interaction; whistler-mode chorus wave
AbstractDuring 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 MLT=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.
URLhttp://onlinelibrary.wiley.com/doi/10.1002/2017GL075894/full
DOI10.1002/2017GL075894
Short TitleGeophys. Res. Lett.


Page Last Modified: March 2, 2018