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 »
- Authors:
-
[1];
[3];
[4];
[5];
[6];
[7];
[6];
[5];
[8];
[9];
- Chinese Academy of Sciences (CAS), Beijing (China); Shandong Univ., Weihai (China)
- Shandong Univ., Weihai (China)
- Wuhan Univ. (China)
- Univ. of Science and Technology of China, Hefei (China)
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Univ. of New Hampshire, Durham, NH (United States)
- Univ. of Colorado, Boulder, CO (United States)
- The Aerospace Corporation, Los Angeles CA (United States)
- Univ. of Minnesota, Minneapolis, MN (United States)
- Publication Date:
- Research Org.:
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Sponsoring Org.:
- National Aeronautics 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. https://doi.org/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. https://doi.org/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 = {Tue Jun 12 00:00:00 EDT 2018},
month = {Tue Jun 12 00:00:00 EDT 2018}
}
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Works referencing / citing this record:
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