Home » Wang et al. 2020

The Effect of Plasma Boundaries on the Dynamic Evolution of Relativistic Radiation Belt Electrons

Wang D., Y. Y. Shprits, I. S. Zhelavskaya, F. Effenberger, A. Castillo, A. Y. Drozdov, N. Aseev, S. Cervantes Villa, (2020), The Effect of Plasma Boundaries on the Dynamic Evolution of Relativistic Radiation Belt Electrons, J. of Geophys. Res. [Space Physics], n/a, e2019JA027422, doi:10.1029/2019JA027422, e2019JA027422 2019JA027422

Abstract

Abstract Understanding the dynamic evolution of relativistic electrons in the Earth's radiation belts during both storm and non-storm times is a challenging task. The U.S. National Science Foundation's Geospace Environment Modeling (GEM) focus group ``Quantitative Assessment of Radiation Belt Modeling' (QARBM) has selected two storm time and two non-storm time events that occurred during the second year of the Van Allen Probes mission for in-depth study. Here, we perform simulations for these GEM challenge events using the 3-Dimensional Versatile Electron Radiation Belt (VERB-3D) code. We set up the outer L* boundary using data from the Geostationary Operational Environmental Satellites (GOES) and validate the simulation results against satellite observations from both the GOES and Van Allen Probe missions for 0.9 MeV electrons. Our results show that the position of the plasmapause plays a significant role in the dynamic evolution of relativistic electrons. The magnetopause shadowing effect is included by using last closed drift shell (LCDS), and it is shown to significantly contribute to the dropouts of relativistic electrons at high L*. We perform simulations using 4 different empirical radial diffusion coefficient models for the GEM Challenge Events, and the results show that these simulations reproduce the general dynamic evolution of relativistic radiation belt electrons. However, in the events shown here, simulations using the radial diffusion coefficients from Brautigam and Albert (2000) produce the best agreement with satellite observations.

Authors (sorted by name)

Aseev Castillo Cervantes Villa Drozdov Effenberger Shprits Wang Zhelavskaya

Journal / Conference

Journal Of Geophysical Research (Space Physics)

Grants

80NSSC18K0663

Bibtex

@article{doi:10.1029/2019JA027422,
author = {Wang, Dedong and Shprits, Yuri Y. and Zhelavskaya, Irina S. and Effenberger, Frederic and Castillo, Angelica and Drozdov, Alexander Y. and Aseev, Nikita and Cervantes Villa, Sebastian},
title = {The Effect of Plasma Boundaries on the Dynamic Evolution of Relativistic Radiation Belt Electrons},
journal = {Journal of Geophysical Research: Space Physics},
year = {2020},
volume = {n/a},
number = {n/a},
pages = {e2019JA027422},
keywords = {radiation belt, simulation, relativistic electrons, magnetopause shadowing, wave-particle interaction, plasmapause},
doi = {10.1029/2019JA027422},
url = {https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2019JA027422},
eprint = {https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/2019JA027422},
note = {e2019JA027422 2019JA027422},
abstract = {Abstract Understanding the dynamic evolution of relativistic electrons in the Earth's radiation belts during both storm and non-storm times is a challenging task. The U.S. National Science Foundation's Geospace Environment Modeling (GEM) focus group ``Quantitative Assessment of Radiation Belt Modeling' (QARBM) has selected two storm time and two non-storm time events that occurred during the second year of the Van Allen Probes mission for in-depth study. Here, we perform simulations for these GEM challenge events using the 3-Dimensional Versatile Electron Radiation Belt (VERB-3D) code. We set up the outer L* boundary using data from the Geostationary Operational Environmental Satellites (GOES) and validate the simulation results against satellite observations from both the GOES and Van Allen Probe missions for 0.9 MeV electrons. Our results show that the position of the plasmapause plays a significant role in the dynamic evolution of relativistic electrons. The magnetopause shadowing effect is included by using last closed drift shell (LCDS), and it is shown to significantly contribute to the dropouts of relativistic electrons at high L*. We perform simulations using 4 different empirical radial diffusion coefficient models for the GEM Challenge Events, and the results show that these simulations reproduce the general dynamic evolution of relativistic radiation belt electrons. However, in the events shown here, simulations using the radial diffusion coefficients from Brautigam and Albert (2000) produce the best agreement with satellite observations.}
}