Chorus acceleration of radiation belt relativistic electrons during March 2013 geomagnetic storm

TitleChorus acceleration of radiation belt relativistic electrons during March 2013 geomagnetic storm
Publication TypeJournal Article
Year of Publication2014
AuthorsXiao, F, Yang, C, He, Z, Su, Z, Zhou, Q, He, Y, Kletzing, CA, Kurth, WS, Hospodarsky, GB, Spence, HE, Reeves, GD, Funsten, HO, Blake, JB, Baker, DN, Wygant, JR
JournalJournal of Geophysical Research: Space Physics
Volume119
Issue5
Pagination3325 - 3332
Date Published05/2014
KeywordsVan Allen Probes
AbstractThe recent launching of Van Allen probes provides an unprecedent opportunity to investigate variations of the radiation belt relativistic electrons. During the 17–19 March 2013 storm, the Van Allen probes simultaneously detected strong chorus waves and substantial increases in fluxes of relativistic (2 − 4.5 MeV) electrons around L = 4.5. Chorus waves occurred within the lower band 0.1–0.5fce (the electron equatorial gyrofrequency), with a peak spectral density ∼10−4 nT2/Hz. Correspondingly, relativistic electron fluxes increased by a factor of 102–103 during the recovery phase compared to the main phase levels. By means of a Gaussian fit to the observed chorus spectra, the drift and bounce-averaged diffusion coefficients are calculated and then used to solve a 2-D Fokker-Planck diffusion equation. Numerical simulations demonstrate that the lower-band chorus waves indeed produce such huge enhancements in relativistic electron fluxes within 15 h, fitting well with the observation.
URLhttp://doi.wiley.com/10.1002/2014JA019822
DOI10.1002/2014JA019822
Short TitleJ. Geophys. Res. Space Physics


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