Simulation of Prompt Acceleration of Radiation Belt Electrons During the 16 July 2017 Storm

Maulik Patel, Zhao Li, Mary Hudson, Seth Claudepierre, John Wygant

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

We investigate the prompt enhancement of radiation belt electron flux observed by the Relativistic Electron Proton Telescope instrument on board Van Allen Probes following the 16 July 2017 CME-shock compression using MHD-test particle simulations. The prompt enhancements can be explained by the source population interacting with the azimuthally directed electric field impulses induced by CME-shock compressions of the dayside magnetopause. Electrons in drift resonance with the electric field impulse were accelerated by ∼ 0.6 MeV on a drift period timescale (in minutes) as the impulse propagated from the dayside to the nightside around the flanks of the magnetosphere. MHD test particle simulation of energization and drift phase bunching, due to the bipolar electric field that accompanies the dayside compression and relaxation, is found to be consistent with Van Allen Probes observations. This study reproduces the energy-dependent drift echoes integrated over pitch angle and observed change in spectra for the first time.

Original languageEnglish (US)
Pages (from-to)7222-7229
Number of pages8
JournalGeophysical Research Letters
Volume46
Issue number13
DOIs
StatePublished - Jul 16 2019

Bibliographical note

Funding Information:
This study is supported by NASA grant 80NSSC17K0678 and JHU/APL under NASA contracts NNN16AA09T and NNN06AA01C, and The Aerospace Corporation is supported by JHU/APL contract 967399 under NASA's Prime contract NAS501072. We acknowledge high-performance computing support from NCAR CISL. Van Allen Probe ECT data can be accessed at the website (https://www.rbsp-ect.lanl.gov/rbsp_ect.php) and EFW survey plots at the website (http://rbsp.space.umn.edu/survey/). The simulation data used to create the figures are available at the website (https://github.com/mpatelgr/Patel2019GRL).

Funding Information:
This study is supported by NASA grant 80NSSC17K0678 and JHU/APL under NASA contracts NNN16AA09T and NNN06AA01C, and The Aerospace Corporation is supported by JHU/APL contract 967399 under NASA's Prime contract NAS501072. We acknowledge high-performance computing support from NCAR CISL. Van Allen Probe ECT data can be accessed at the website (https://www.rbsp-ect.lanl. gov/rbsp_ect.php) and EFW survey plots at the website (http://rbsp.space. umn.edu/survey/). The simulation data used to create the figures are available at the website (https://github. com/mpatelgr/Patel2019GRL).

Publisher Copyright:
©2019. American Geophysical Union. All Rights Reserved.

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