Quantitative Evaluation of Radial Diffusion and Local Acceleration Processes During GEM Challenge Events

Ma, Q.; Li, W.; Bortnik, J.; Thorne, R. M.; Chu, X.; Ozeke, L. G.; Reeves, Geoffrey D.; Kletzing, C. A.; Kurth, W. S.; Hospodarsky, G. B.; Engebretson, M. J.; Spence, H. E.; Baker, D. N.; Blake, J. B.; Fennell, J. F.; Claudepierre, S. G.

doi:10.1002/2017JA025114

Title: Quantitative Evaluation of Radial Diffusion and Local Acceleration Processes During GEM Challenge Events

Journal Article · Wed Mar 14 00:00:00 EDT 2018 · Journal of Geophysical Research. Space Physics

DOI:https://doi.org/10.1002/2017JA025114· OSTI ID:1463565

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Univ. of California, Los Angeles, CA (United States). Dept. of Atmospheric and Oceanic Sciences; Boston Univ., MA (United States). Center for Space Physics
Boston Univ., MA (United States). Center for Space Physics
Univ. of California, Los Angeles, CA (United States). Dept. of Atmospheric and Oceanic Sciences
Univ. of Alberta, Edmonton, AB (Canada). Dept. of Physics
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Univ. of Iowa, Iowa City, IA (United States). Dept. of Physics and Astronomy
Augsburg Univ., Minneapolis, MN (United States). Dept. of Physics
Univ. of New Hampshire, Durham, NH (United States). Inst. for the Study of Earth, Oceans, and Space
Univ. of Colorado, Boulder, CO (United States). Lab. for Atmospheric and Space Physics
Aerospace Corporation, Los Angeles, CA (United States)

We simulate the radiation belt electron flux enhancements during selected Geospace Environment Modeling (GEM) challenge events to quantitatively compare the major processes involved in relativistic electron acceleration under different conditions. Van Allen Probes observed significant electron flux enhancement during both the storm time of 17–18 March 2013 and non–storm time of 19–20 September 2013, but the distributions of plasma waves and energetic electrons for the two events were dramatically different. During 17–18 March 2013, the SYM-H minimum reached -130 nT, intense chorus waves (peak B_w ~140 pT) occurred at 3.5 < L < 5.5, and several hundred keV to several MeV electron fluxes increased by ~2 orders of magnitude mostly at 3.5 < L < 5.5. During 19–20 September 2013, the SYM-H remained higher than -30 nT, modestly intense chorus waves (peak B_w ~80 pT) occurred at L > 5.5, and electron fluxes at energies up to 3 MeV increased by a factor of ~5 at L > 5.5. The two electron flux enhancement events were simulated using the available wave distribution and diffusion coefficients from the GEM focus group Quantitative Assessment of Radiation Belt Modeling. By comparing the individual roles of local electron heating and radial transport, our simulation indicates that resonant interaction with chorus waves is the dominant process that accounts for the electron flux enhancement during the storm time event particularly near the flux peak locations, while radial diffusion by ultralow-frequency waves plays a dominant role in the enhancement during the non–storm time event. Incorporation of both processes reasonably reproduces the observed location and magnitude of electron flux enhancement.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE; National Aeronautics and Space Administration (NASA); National Science Foundation (NSF)

Grant/Contract Number:: AC52-06NA25396; PLR-1341493; AGS-1651263; AGS-1723588; 967399; 921647; NX17AD15G; FA9550-15-1-0158; NAS5-01072; NNX15AI96G; NNX11AR64G; NNX14AN85G; NNX14AI18G; NNX17AG07G; AGS 1451911

OSTI ID:: 1463565

Report Number(s):: LA-UR-18-25087

Journal Information:: Journal of Geophysical Research. Space Physics, Vol. 123, Issue 3; ISSN 2169-9380

Publisher:: American Geophysical UnionCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 79 works

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Earth's Van Allen Radiation Belts: From Discovery to the Van Allen Probes Era Li, W.; Hudson, M. K. Journal of Geophysical Research: Space Physics, Vol. 124, Issue 11 https://doi.org/10.1029/2018ja025940	journal	November 2019
Impact of Significant Time‐Integrated Geomagnetic Activity on 2‐MeV Electron Flux Mourenas, D.; Artemyev, A. V.; Zhang, X. ‐J. Journal of Geophysical Research: Space Physics, Vol. 124, Issue 6 https://doi.org/10.1029/2019ja026659	journal	June 2019
Analytical Chorus Wave Model Derived from Van Allen Probe Observations Wang, Dedong; Shprits, Yuri Y.; Zhelavskaya, Irina S. Journal of Geophysical Research: Space Physics, Vol. 124, Issue 2 https://doi.org/10.1029/2018ja026183	journal	February 2019
On the Close Correspondence Between Storm Time ULF Wave Power and the POES VLF Chorus Wave Amplitude Proxy Dimitrakoudis, Stavros; Mann, Ian R. Geophysical Research Letters, Vol. 46, Issue 4 https://doi.org/10.1029/2018gl081317	journal	February 2019
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radiation belt simulation
electron acceleration
whistler mode waves
radial diffusion
Van Allen Probes observation

Title: Quantitative Evaluation of Radial Diffusion and Local Acceleration Processes During GEM Challenge Events

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