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Title: Rapid Enhancements of the Seed Populations in the Heart of the Earth's Outer Radiation Belt: A Multicase Study

Abstract

To better understand rapid enhancements of the seed populations (100s keV electrons) in the heart of the Earth’s outer radiation belt (L*~3.5–5.0) during different geomagnetic activities, we investigate three enhancement events measured by Van Allen Probes in detail. Observations of the fluxes and the pitch angle distributions of energetic electrons are analyzed to determine rapid enhancements of the seed populations. Our study shows that three specified processes associated with substorm electron injections can lead to rapid enhancements of the seed populations, and the electron energy increases up to 342 keV. In the first process, substorm electron injections accompanied by the transient and intense substorm electric fields can directly lead to rapid enhancements of the seed populations in the heart of the outer radiation belt. In the second process, the substorm injected electrons are first trapped in the outer radiation belt, and subsequently transported into L*<4.5 by the convection electric field. In the third process, the lower-energy electrons are first injected at L*~5.3, and then undergo drift resonance with ultralow frequency (ULF) waves. These accelerated electrons by ULF waves are further transported into L*<4.5 due to the convection electric field. This process is consistent with the radial diffusion. Our results suggestmore » that these specified processes are important for understanding the dynamics of the seed populations in the heart of the outer radiation belt.« less

Authors:
ORCiD logo [1];  [2]; ORCiD logo [3]; ORCiD logo [4]; ORCiD logo [5]; ORCiD logo [6]; ORCiD logo [7]; ORCiD logo [6]; ORCiD logo [5]; ORCiD logo [8]; ORCiD logo [9];  [4]
  1. Chinese Academy of Sciences (CAS), Beijing (China); Shandong Univ., Weihai (China)
  2. Shandong Univ., Weihai (China)
  3. Wuhan Univ. (China)
  4. Univ. of Science and Technology of China, Hefei (China)
  5. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  6. Univ. of New Hampshire, Durham, NH (United States)
  7. Univ. of Colorado, Boulder, CO (United States)
  8. The Aerospace Corporation, Los Angeles CA (United States)
  9. 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:
1558215
Report Number(s):
LA-UR-18-31205
Journal ID: ISSN 2169-9380
Grant/Contract Number:  
89233218CNA000001
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Geophysical Research. Space Physics
Additional Journal Information:
Journal Volume: 123; Journal Issue: 6; Journal ID: ISSN 2169-9380
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; Heliospheric and Magnetospheric Physics

Citation Formats

Tang, C. L., Xie, X. J., Ni, B., Su, Z. P., Reeves, G. D., Zhang, J. -C., Baker, D. N., Spence, H. E., Funsten, H. O., Blake, J. B., Wygant, J. R., and Dai, G. Y. Rapid Enhancements of the Seed Populations in the Heart of the Earth's Outer Radiation Belt: A Multicase Study. United States: N. p., 2018. Web. doi:10.1029/2017JA025142.
Tang, C. L., Xie, X. J., Ni, B., Su, Z. P., Reeves, G. D., Zhang, J. -C., Baker, D. N., Spence, H. E., Funsten, H. O., Blake, J. B., Wygant, J. R., & Dai, G. Y. Rapid Enhancements of the Seed Populations in the Heart of the Earth's Outer Radiation Belt: A Multicase Study. United States. doi:10.1029/2017JA025142.
Tang, C. L., Xie, X. J., Ni, B., Su, Z. P., Reeves, G. D., Zhang, J. -C., Baker, D. N., Spence, H. E., Funsten, H. O., Blake, J. B., Wygant, J. R., and Dai, G. Y. Tue . "Rapid Enhancements of the Seed Populations in the Heart of the Earth's Outer Radiation Belt: A Multicase Study". United States. doi:10.1029/2017JA025142. https://www.osti.gov/servlets/purl/1558215.
@article{osti_1558215,
title = {Rapid Enhancements of the Seed Populations in the Heart of the Earth's Outer Radiation Belt: A Multicase Study},
author = {Tang, C. L. and Xie, X. J. and Ni, B. and Su, Z. P. and Reeves, G. D. and Zhang, J. -C. and Baker, D. N. and Spence, H. E. and Funsten, H. O. and Blake, J. B. and Wygant, J. R. and Dai, G. Y.},
abstractNote = {To better understand rapid enhancements of the seed populations (100s keV electrons) in the heart of the Earth’s outer radiation belt (L*~3.5–5.0) during different geomagnetic activities, we investigate three enhancement events measured by Van Allen Probes in detail. Observations of the fluxes and the pitch angle distributions of energetic electrons are analyzed to determine rapid enhancements of the seed populations. Our study shows that three specified processes associated with substorm electron injections can lead to rapid enhancements of the seed populations, and the electron energy increases up to 342 keV. In the first process, substorm electron injections accompanied by the transient and intense substorm electric fields can directly lead to rapid enhancements of the seed populations in the heart of the outer radiation belt. In the second process, the substorm injected electrons are first trapped in the outer radiation belt, and subsequently transported into L*<4.5 by the convection electric field. In the third process, the lower-energy electrons are first injected at L*~5.3, and then undergo drift resonance with ultralow frequency (ULF) waves. These accelerated electrons by ULF waves are further transported into L*<4.5 due to the convection electric field. This process is consistent with the radial diffusion. Our results suggest that these specified processes are important for understanding the dynamics of the seed populations in the heart of the outer radiation belt.},
doi = {10.1029/2017JA025142},
journal = {Journal of Geophysical Research. Space Physics},
number = 6,
volume = 123,
place = {United States},
year = {2018},
month = {6}
}

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Works referenced in this record:

Particle substorms observed at the geostationary orbit
journal, October 1969


Fermi and betatron acceleration of suprathermal electrons behind dipolarization fronts: FERMI VERSUS BETATRON BEHIND DF
journal, August 2011

  • Fu, H. S.; Khotyaintsev, Y. V.; André, M.
  • Geophysical Research Letters, Vol. 38, Issue 16
  • DOI: 10.1029/2011GL048528

Direct Observation of Radiation-Belt Electron Acceleration from Electron-Volt Energies to Megavolts by Nonlinear Whistlers
journal, July 2014


The effects of transient, localized electric fields on equatorial electron acceleration and transport toward the inner magnetosphere: LOCALIZED ELECTRIC FIELDS AND INJECTIONS
journal, October 2012

  • Gabrielse, C.; Angelopoulos, V.; Runov, A.
  • Journal of Geophysical Research: Space Physics, Vol. 117, Issue A10
  • DOI: 10.1029/2012JA017873

Nonlinear electric field structures in the inner magnetosphere
journal, August 2014

  • Malaspina, D. M.; Andersson, L.; Ergun, R. E.
  • Geophysical Research Letters, Vol. 41, Issue 16
  • DOI: 10.1002/2014GL061109

Neutral line model of substorms: Past results and present view
journal, June 1996

  • Baker, D. N.; Pulkkinen, T. I.; Angelopoulos, V.
  • Journal of Geophysical Research: Space Physics, Vol. 101, Issue A6
  • DOI: 10.1029/95JA03753

Cluster observations of earthward propagating plasmoid and flux ropes in the near-tail during the course of a substorm event
journal, May 2009


Combined convective and diffusive simulations: VERB-4D comparison with 17 March 2013 Van Allen Probes observations: VERB-4D
journal, November 2015

  • Shprits, Yuri Y.; Kellerman, Adam C.; Drozdov, Alexander Y.
  • Geophysical Research Letters, Vol. 42, Issue 22
  • DOI: 10.1002/2015GL065230

THEMIS observations of the near-Earth plasma sheet during a substorm: THEMIS OBSERVATIONS OF SUBSTORM
journal, September 2009

  • Tang, C. L.; Li, Z. Y.; Angelopoulos, V.
  • Journal of Geophysical Research: Space Physics, Vol. 114, Issue A9
  • DOI: 10.1029/2008JA013729

Resonant acceleration and diffusion of outer zone electrons in an asymmetric geomagnetic field
journal, January 2003


The Magnetic Electron Ion Spectrometer (MagEIS) Instruments Aboard the Radiation Belt Storm Probes (RBSP) Spacecraft
journal, June 2013

  • Blake, J. B.; Carranza, P. A.; Claudepierre, S. G.
  • Space Science Reviews, Vol. 179, Issue 1-4
  • DOI: 10.1007/s11214-013-9991-8

The Electric and Magnetic Field Instrument Suite and Integrated Science (EMFISIS) on RBSP
journal, June 2013


Van Allen Probes observation of localized drift resonance between poloidal mode ultra-low frequency waves and 60 keV electrons: ULF DRIFT RESONANCE
journal, September 2013

  • Claudepierre, S. G.; Mann, I. R.; Takahashi, K.
  • Geophysical Research Letters, Vol. 40, Issue 17
  • DOI: 10.1002/grl.50901

Adiabatic charged-particle motion
journal, January 1963


The Electric Field and Waves Instruments on the Radiation Belt Storm Probes Mission
journal, October 2013


Substorm electron injections: Geosynchronous observations and test particle simulations
journal, May 1998

  • Birn, J.; Thomsen, M. F.; Borovsky, J. E.
  • Journal of Geophysical Research: Space Physics, Vol. 103, Issue A5
  • DOI: 10.1029/97JA02635

Rapid local acceleration of relativistic radiation-belt electrons by magnetospheric chorus
journal, December 2013


Strong enhancement of 10–100 keV electron fluxes by combined effects of chorus waves and time domain structures
journal, May 2016

  • Ma, Qianli; Mourenas, Didier; Artemyev, Anton
  • Geophysical Research Letters, Vol. 43, Issue 10
  • DOI: 10.1002/2016GL069125

Electron Acceleration in the Heart of the Van Allen Radiation Belts
journal, July 2013


The effects of geomagnetic storms on electrons in Earth's radiation belts: RADIATION BELT ELECTRON RESPONSES TO STORMS
journal, November 2015

  • Turner, D. L.; O'Brien, T. P.; Fennell, J. F.
  • Geophysical Research Letters, Vol. 42, Issue 21
  • DOI: 10.1002/2015GL064747

Evidence for injection of relativistic electrons into the Earth's outer radiation belt via intense substorm electric fields
journal, February 2014

  • Dai, Lei; Wygant, John R.; Cattell, Cynthia A.
  • Geophysical Research Letters, Vol. 41, Issue 4
  • DOI: 10.1002/2014GL059228

Quantifying the radiation belt seed population in the 17 March 2013 electron acceleration event
journal, April 2014

  • Boyd, A. J.; Spence, H. E.; Claudepierre, S. G.
  • Geophysical Research Letters, Vol. 41, Issue 7
  • DOI: 10.1002/2014GL059626

Resonant scattering of energetic electrons by unusual low-frequency hiss
journal, March 2014

  • Ni, Binbin; Li, Wen; Thorne, Richard M.
  • Geophysical Research Letters, Vol. 41, Issue 6
  • DOI: 10.1002/2014GL059389

Nonstorm time dynamics of electron radiation belts observed by the Van Allen Probes
journal, January 2014

  • Su, Zhenpeng; Xiao, Fuliang; Zheng, Huinan
  • Geophysical Research Letters, Vol. 41, Issue 2
  • DOI: 10.1002/2013GL058912

Science Objectives and Rationale for the Radiation Belt Storm Probes Mission
journal, September 2012