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Title: Nonstorm time dropout of radiation belt electron fluxes on 24 September 2013

Abstract

Radiation belt electron flux dropouts during the main phase of geomagnetic storms have received increasing attention in recent years. Here we focus on a rarely reported nonstorm time dropout event observed by Van Allen Probes on 24 September 2013. Within several hours, the radiation belt electron fluxes exhibited a significant (up to 2 orders of magnitude) depletion over a wide range of radial distances (L > 4.5), energies (~500 keV to several MeV) and equatorial pitch angles (0° ≤ αe ≤ 180°). STEERB simulations show that the relativistic electron loss in the region L = 4.5–6.0 was primarily caused by the pitch angle scattering of observed plasmaspheric hiss and electromagnetic ion cyclotron waves. Furthermore, our results emphasize the complexity of radiation belt dynamics and the importance of wave-driven precipitation loss even during nonstorm times.

Authors:
 [1];  [1];  [2];  [3];  [4];  [4];  [1];  [1];  [1];  [5];  [6];  [7];  [8]
  1. Univ. of Science and Technology of China, Hefei (China)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States); New Mexico Consortium, Los Alamos, NM (United States)
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  4. Univ. of California, Los Angeles, CA (United States)
  5. Univ. of New Hampshire, Durham, NH (United States). Dept. of Physics
  6. Univ. of Colorado, Boulder, CO (United States)
  7. The Aerospace Corp., Los Angeles, CA (United States)
  8. Univ. of Minnesota, Minneapolis, MN (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
National Aeronautic and Space Administration (NASA); USDOE
OSTI Identifier:
1291235
Report Number(s):
LA-UR-16-23140
Journal ID: ISSN 2169-9380
Grant/Contract Number:  
AC52-06NA25396
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Geophysical Research. Space Physics
Additional Journal Information:
Journal Name: Journal of Geophysical Research. Space Physics; Journal ID: ISSN 2169-9380
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; Heliospheric and Magnetospheric Physics

Citation Formats

Su, Zhenpeng, Gao, Zhonglei, Reeves, Geoffrey D., Funsten, Herbert O., Zhu, Hui, Li, Wen, Zheng, Huinan, Wang, Yuming, Wang, Shui, Spence, H. E., Baker, D. N., Blake, J. B., and Wygant, J. R. Nonstorm time dropout of radiation belt electron fluxes on 24 September 2013. United States: N. p., 2016. Web. doi:10.1002/2016JA022546.
Su, Zhenpeng, Gao, Zhonglei, Reeves, Geoffrey D., Funsten, Herbert O., Zhu, Hui, Li, Wen, Zheng, Huinan, Wang, Yuming, Wang, Shui, Spence, H. E., Baker, D. N., Blake, J. B., & Wygant, J. R. Nonstorm time dropout of radiation belt electron fluxes on 24 September 2013. United States. doi:10.1002/2016JA022546.
Su, Zhenpeng, Gao, Zhonglei, Reeves, Geoffrey D., Funsten, Herbert O., Zhu, Hui, Li, Wen, Zheng, Huinan, Wang, Yuming, Wang, Shui, Spence, H. E., Baker, D. N., Blake, J. B., and Wygant, J. R. Fri . "Nonstorm time dropout of radiation belt electron fluxes on 24 September 2013". United States. doi:10.1002/2016JA022546. https://www.osti.gov/servlets/purl/1291235.
@article{osti_1291235,
title = {Nonstorm time dropout of radiation belt electron fluxes on 24 September 2013},
author = {Su, Zhenpeng and Gao, Zhonglei and Reeves, Geoffrey D. and Funsten, Herbert O. and Zhu, Hui and Li, Wen and Zheng, Huinan and Wang, Yuming and Wang, Shui and Spence, H. E. and Baker, D. N. and Blake, J. B. and Wygant, J. R.},
abstractNote = {Radiation belt electron flux dropouts during the main phase of geomagnetic storms have received increasing attention in recent years. Here we focus on a rarely reported nonstorm time dropout event observed by Van Allen Probes on 24 September 2013. Within several hours, the radiation belt electron fluxes exhibited a significant (up to 2 orders of magnitude) depletion over a wide range of radial distances (L > 4.5), energies (~500 keV to several MeV) and equatorial pitch angles (0° ≤ αe ≤ 180°). STEERB simulations show that the relativistic electron loss in the region L = 4.5–6.0 was primarily caused by the pitch angle scattering of observed plasmaspheric hiss and electromagnetic ion cyclotron waves. Furthermore, our results emphasize the complexity of radiation belt dynamics and the importance of wave-driven precipitation loss even during nonstorm times.},
doi = {10.1002/2016JA022546},
journal = {Journal of Geophysical Research. Space Physics},
number = ,
volume = ,
place = {United States},
year = {2016},
month = {7}
}

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