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Filters: Author is Zheng, Liheng  [Clear All Filters]
2020
Authors: Zhu Hui, Chen Lunjin, Claudepierre Seth G., and Zheng Liheng
Title: Direct evidence of the pitch angle scattering of relativistic electrons induced by EMIC waves
Abstract: In this study, we analyze an EMIC wave event of rising tone elements recorded by the Van Allen Probes. The pitch angle distributions of relativistic electrons exhibit a direct response to the two elements of EMIC waves: at the intermediate pitch angle the fluxes are lower and at the low pitch angle the fluxes are higher than those when no EMIC was observed. In particular, the observed changes in the pitch angle distributions are most likely to be caused by nonlinear wave particle interaction. The calculation of the minimum resonant energy and a test particle simulation based on the observed EMIC waves support the role of the nonlinear wave‐particle interaction in the pitch angle scattering. This study provides direct evidence for the nonlinear pitch angle scattering of electrons by EMIC . . .
Date: 01/2020 Publisher: Geophysical Research Letters DOI: 10.1029/2019GL085637 Available at: https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2019GL085637
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2014
Authors: Zheng Liheng, Chan Anthony A, Albert Jay M, Elkington Scot R, Koller Josef, et al.
Title: Three-dimensional stochastic modeling of radiation belts in adiabatic invariant coordinates
Abstract: A 3-D model for solving the radiation belt diffusion equation in adiabatic invariant coordinates has been developed and tested. The model, named Radbelt Electron Model, obtains a probabilistic solution by solving a set of Itô stochastic differential equations that are mathematically equivalent to the diffusion equation. This method is capable of solving diffusion equations with a full 3-D diffusion tensor, including the radial-local cross diffusion components. The correct form of the boundary condition at equatorial pitch angle α0=90° is also derived. The model is applied to a simulation of the October 2002 storm event. At α0 near 90°, our results are quantitatively consistent with GPS observations of phase space density (PSD) increases, suggesting dominance of radial diffusion; at sm. . .
Date: 09/2014 Publisher: Journal of Geophysical Research: Space Physics Pages: 7615 - 7635 DOI: 10.1002/jgra.v119.910.1002/2014JA020127 Available at: http://doi.wiley.com/10.1002/jgra.v119.9http://doi.wiley.com/10.1002/2014JA020127
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