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Title: Ring current electron dynamics during geomagnetic storms based on the Van Allen Probes measurements: Ring Current Electrons

Abstract

Based on comprehensive measurements from Helium, Oxygen, Proton, and Electron Mass Spectrometer Ion Spectrometer, Relativistic Electron-Proton Telescope, and Radiation Belt Storm Probes Ion Composition Experiment instruments on the Van Allen Probes, comparative studies of ring current electrons and ions are performed and the role of energetic electrons in the ring current dynamics is investigated. The deep injections of tens to hundreds of keV electrons and tens of keV protons into the inner magnetosphere occur frequently; after the injections the electrons decay slowly in the inner belt but protons in the low L region decay very fast. Intriguing similarities between lower energy protons and higher-energy electrons are also found. The evolution of ring current electron and ion energy densities and energy content are examined in detail during two geomagnetic storms, one moderate and one intense. Here, the results show that the contribution of ring current electrons to the ring current energy content is much smaller than that of ring current ions (up to ~12% for the moderate storm and ~7% for the intense storm), and <35 keV electrons dominate the ring current electron energy content at the storm main phases. Though the electron energy content is usually much smaller than thatmore » of ions, the enhancement of ring current electron energy content during the moderate storm can get to ~30% of that of ring current ions, indicating a more dynamic feature of ring current electrons and important role of electrons in the ring current buildup. Lastly, the ring current electron energy density is also shown to be higher at midnight and dawn while lower at noon and dusk.« less

Authors:
 [1];  [1];  [2];  [3];  [3];  [3]; ORCiD logo [4];  [5]; ORCiD logo [5]; ORCiD logo [4]; ORCiD logo [4];  [6];  [7];  [8]
  1. Univ. of Colorado, Boulder, CO (United States). Lab. for Atmospheric and Space Physics; Univ. of Colorado, Boulder, CO (United States). Dept. of Aerospace Engineering Sciences
  2. Univ. of Colorado, Boulder, CO (United States). Lab. for Atmospheric and Space Physics
  3. Aerospace Corporation, Los Angeles, CA (United States). Space Sciences Dept.
  4. Los Alamos National Lab. (LANL), Los Alamos, NM (United States); New Mexico Consortium, Los Alamos, NM (United States)
  5. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  6. Univ. of New Hampshire, Durham, NH (United States). Inst. for the Study of Earth, Oceans, and Space
  7. Johns Hopkins Univ., Laurel, MD (United States). Space Dept.
  8. New Jersey Inst. of Technology, Newark, NJ (United States). Center for Solar-Terrestrial Research
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
National Aeronautic and Space Administration (NASA); National Science Foundation (NSF); USDOE
OSTI Identifier:
1402603
Report Number(s):
LA-UR-16-20483
Journal ID: ISSN 2169-9380; TRN: US1703002
Grant/Contract Number:  
AC52-06NA25396; AGS 1131869; NNH14AX18I; 967399; NAS5-01072
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Geophysical Research. Space Physics
Additional Journal Information:
Journal Volume: 121; Journal Issue: 4; Journal ID: ISSN 2169-9380
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 58 GEOSCIENCES; Heliospheric and Magnetospheric Physics; ring current; geomagnetic storms; Van Allen Probes; ring current electrons; deep injections; ring current energy content

Citation Formats

Zhao, H., Li, X., Baker, D. N., Claudepierre, S. G., Fennell, J. F., Blake, J. B., Larsen, Brian Arthur, Skoug, Ruth M., Funsten, Herbert O., Friedel, Reinhard Hans Walter, Reeves, Geoffrey D., Spence, H. E., Mitchell, D. G., and Lanzerotti, L. J. Ring current electron dynamics during geomagnetic storms based on the Van Allen Probes measurements: Ring Current Electrons. United States: N. p., 2016. Web. doi:10.1002/2016JA022358.
Zhao, H., Li, X., Baker, D. N., Claudepierre, S. G., Fennell, J. F., Blake, J. B., Larsen, Brian Arthur, Skoug, Ruth M., Funsten, Herbert O., Friedel, Reinhard Hans Walter, Reeves, Geoffrey D., Spence, H. E., Mitchell, D. G., & Lanzerotti, L. J. Ring current electron dynamics during geomagnetic storms based on the Van Allen Probes measurements: Ring Current Electrons. United States. doi:10.1002/2016JA022358.
Zhao, H., Li, X., Baker, D. N., Claudepierre, S. G., Fennell, J. F., Blake, J. B., Larsen, Brian Arthur, Skoug, Ruth M., Funsten, Herbert O., Friedel, Reinhard Hans Walter, Reeves, Geoffrey D., Spence, H. E., Mitchell, D. G., and Lanzerotti, L. J. Sat . "Ring current electron dynamics during geomagnetic storms based on the Van Allen Probes measurements: Ring Current Electrons". United States. doi:10.1002/2016JA022358. https://www.osti.gov/servlets/purl/1402603.
@article{osti_1402603,
title = {Ring current electron dynamics during geomagnetic storms based on the Van Allen Probes measurements: Ring Current Electrons},
author = {Zhao, H. and Li, X. and Baker, D. N. and Claudepierre, S. G. and Fennell, J. F. and Blake, J. B. and Larsen, Brian Arthur and Skoug, Ruth M. and Funsten, Herbert O. and Friedel, Reinhard Hans Walter and Reeves, Geoffrey D. and Spence, H. E. and Mitchell, D. G. and Lanzerotti, L. J.},
abstractNote = {Based on comprehensive measurements from Helium, Oxygen, Proton, and Electron Mass Spectrometer Ion Spectrometer, Relativistic Electron-Proton Telescope, and Radiation Belt Storm Probes Ion Composition Experiment instruments on the Van Allen Probes, comparative studies of ring current electrons and ions are performed and the role of energetic electrons in the ring current dynamics is investigated. The deep injections of tens to hundreds of keV electrons and tens of keV protons into the inner magnetosphere occur frequently; after the injections the electrons decay slowly in the inner belt but protons in the low L region decay very fast. Intriguing similarities between lower energy protons and higher-energy electrons are also found. The evolution of ring current electron and ion energy densities and energy content are examined in detail during two geomagnetic storms, one moderate and one intense. Here, the results show that the contribution of ring current electrons to the ring current energy content is much smaller than that of ring current ions (up to ~12% for the moderate storm and ~7% for the intense storm), and <35 keV electrons dominate the ring current electron energy content at the storm main phases. Though the electron energy content is usually much smaller than that of ions, the enhancement of ring current electron energy content during the moderate storm can get to ~30% of that of ring current ions, indicating a more dynamic feature of ring current electrons and important role of electrons in the ring current buildup. Lastly, the ring current electron energy density is also shown to be higher at midnight and dawn while lower at noon and dusk.},
doi = {10.1002/2016JA022358},
journal = {Journal of Geophysical Research. Space Physics},
number = 4,
volume = 121,
place = {United States},
year = {2016},
month = {4}
}

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