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2019
Authors: Zhao Wanli, Liu Si, Zhang Sai, Zhou Qinghua, Yang Chang, et al.
Title: Global Occurrences of Auroral Kilometric Radiation Related to Suprathermal Electrons in Radiation Belts
Abstract: Auroral kilometric radiation (AKR) can potentially produce serious damage to space‐borne systems by accelerating trapped radiation belt electrons to relativistic energies. Here we examine the global occurrences of AKR emissions in radiation belts based on Van Allen Probes observations from 1 October 2012 to 31 December 2016. The statistical results (1,848 events in total) show that AKR covers a broad region of L= 3–6.5 and 00–24 magnetic local time (MLT), with a higher occurrence on the nightside (20–24 MLT and 00–04 MLT) within L= 5–6.5. All the AKR events are observed to be accompanied with suprathermal (∼1 keV) electron flux enhancements. During active geomagnetic periods, both AKR occurrences and electron injections tend to be more distinct, and AKR emission extends to th. . .
Date: 07/2019 Publisher: Geophysical Research Letters DOI: 10.1029/2019GL083944 Available at: https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2019GL083944
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2018
Authors: Yang Chang, Xiao Fuliang, He Yihua, Liu Si, Zhou Qinghua, et al.
Title: Storm-time evolution of outer radiation belt relativistic electrons by a nearly continuous distribution of chorus
Abstract: 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 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∘. . .
Date: 02/2018 Publisher: Geophysical Research Letters DOI: 10.1002/2017GL075894 Available at: http://onlinelibrary.wiley.com/doi/10.1002/2017GL075894/full
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