Quantitative Evaluation of Radial Diffusion and Local Acceleration Processes During GEM Challenge Events
Abstract
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 Bw ~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 Bw ~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 simulationmore »
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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)
- Publication Date:
- Research Org.:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Org.:
- USDOE; National Aeronautics and Space Administration (NASA); National Science Foundation (NSF)
- OSTI Identifier:
- 1463565
- Report Number(s):
- LA-UR-18-25087
Journal ID: ISSN 2169-9380
- 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
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Geophysical Research. Space Physics
- Additional Journal Information:
- Journal Volume: 123; Journal Issue: 3; Journal ID: ISSN 2169-9380
- Publisher:
- American Geophysical Union
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 58 GEOSCIENCES; Heliospheric and Magnetospheric Physics; radiation belt simulation; electron acceleration; whistler mode waves; radial diffusion; Van Allen Probes observation
Citation Formats
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., and Claudepierre, S. G. Quantitative Evaluation of Radial Diffusion and Local Acceleration Processes During GEM Challenge Events. United States: N. p., 2018.
Web. doi:10.1002/2017JA025114.
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. Quantitative Evaluation of Radial Diffusion and Local Acceleration Processes During GEM Challenge Events. United States. https://doi.org/10.1002/2017JA025114
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., and Claudepierre, S. G. Wed .
"Quantitative Evaluation of Radial Diffusion and Local Acceleration Processes During GEM Challenge Events". United States. https://doi.org/10.1002/2017JA025114. https://www.osti.gov/servlets/purl/1463565.
@article{osti_1463565,
title = {Quantitative Evaluation of Radial Diffusion and Local Acceleration Processes During GEM Challenge Events},
author = {Ma, Q. and Li, W. and Bortnik, J. and Thorne, R. M. and Chu, X. and Ozeke, L. G. and Reeves, Geoffrey D. and Kletzing, C. A. and Kurth, W. S. and Hospodarsky, G. B. and Engebretson, M. J. and Spence, H. E. and Baker, D. N. and Blake, J. B. and Fennell, J. F. and Claudepierre, S. G.},
abstractNote = {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 Bw ~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 Bw ~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.},
doi = {10.1002/2017JA025114},
journal = {Journal of Geophysical Research. Space Physics},
number = 3,
volume = 123,
place = {United States},
year = {Wed Mar 14 00:00:00 EDT 2018},
month = {Wed Mar 14 00:00:00 EDT 2018}
}
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