A Short-lived Three-Belt Structure for sub-MeV Electrons in the Van Allen Belts: Time Scale and Energy Dependence
Abstract
In this study we focus on the radiation belt dynamics driven by the geomagnetic storms during September 2017. Besides the long-lasting three-belt structures of ultrarelativistic electrons (>2 MeV, existing for tens of days), which has been studied intensively during the Van Allen Probe era, it is found that magnetospheric electrons of hundreds of keVs can also have three-belt structures at similar L extent during storm time. Measurements of 500–800 keV electrons from MagEIS instrument onboard Van Allen Probes show double-peaked (L = 3.5 and 4.5, respectively) flux-versus-L-shell profile in the outer belt, which lasted for 2–3 days. During the time interval of such transient three-belt structure, the energy-versus-L spectrogram shows novel distributions differing from both “S-shaped” and “V-shaped” spectrograms reported previously. Such peculiar distribution also illustrates the energy-dependent occurrence of the three-belt profile. Furthermore, the gradual formation of “reversed energy spectrum” at L ~ 3.5 also indicates that hiss scattering inside the plasmapause contributed to the fast decay of sub-MeV remnant belt.
- Authors:
-
[5];
[6];
[7]
- Peking Univ., Beijing (China)
- Univ. of Alberta, Edmonton, AL (Canada)
- Univ. of Colorado, Boulder, CO (United States). Lab. of Atmospheric and Space Physics
- Univ. of New Hampshire, Durham, NH (United States)
- The Aerospace Corp., El Segundo, CA (United States). Space Science Applications Lab.
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- The Aerospace Corp., El Segundo, CA (United States). Space Science Applications Lab.; Univ. of California, Los Angeles, CA (United States)
- Publication Date:
- Research Org.:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Org.:
- USDOE; National Natural Science Foundation of China (NSFC); Natural Sciences and Engineering Research Council of Canada (NSERC); National Aeronautics and Space Administration (NASA)
- OSTI Identifier:
- 1760596
- Report Number(s):
- LA-UR-20-24387
Journal ID: ISSN 2169-9380; TRN: US2205758
- Grant/Contract Number:
- 89233218CNA000001; 41421003; 41641627805; NAS5-01072
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Geophysical Research. Space Physics
- Additional Journal Information:
- Journal Volume: 125; Journal Issue: 9; 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; storage ring; three-belt structure; hiss wave; electron lifetime; radial transport
Citation Formats
Hao, Y. X., Zong, Qiugang, Zhou, X. Z., Zou, H., Rankin, R., Sun, Y. X., Chen, X. R., Liu, Y., Fu, S. Y., Baker, D. N., Spence, H. E., Blake, J. B., Reeves, Geoffrey D., and Claudepierre, S. G. A Short-lived Three-Belt Structure for sub-MeV Electrons in the Van Allen Belts: Time Scale and Energy Dependence. United States: N. p., 2020.
Web. doi:10.1029/2020ja028031.
Hao, Y. X., Zong, Qiugang, Zhou, X. Z., Zou, H., Rankin, R., Sun, Y. X., Chen, X. R., Liu, Y., Fu, S. Y., Baker, D. N., Spence, H. E., Blake, J. B., Reeves, Geoffrey D., & Claudepierre, S. G. A Short-lived Three-Belt Structure for sub-MeV Electrons in the Van Allen Belts: Time Scale and Energy Dependence. United States. https://doi.org/10.1029/2020ja028031
Hao, Y. X., Zong, Qiugang, Zhou, X. Z., Zou, H., Rankin, R., Sun, Y. X., Chen, X. R., Liu, Y., Fu, S. Y., Baker, D. N., Spence, H. E., Blake, J. B., Reeves, Geoffrey D., and Claudepierre, S. G. Thu .
"A Short-lived Three-Belt Structure for sub-MeV Electrons in the Van Allen Belts: Time Scale and Energy Dependence". United States. https://doi.org/10.1029/2020ja028031. https://www.osti.gov/servlets/purl/1760596.
@article{osti_1760596,
title = {A Short-lived Three-Belt Structure for sub-MeV Electrons in the Van Allen Belts: Time Scale and Energy Dependence},
author = {Hao, Y. X. and Zong, Qiugang and Zhou, X. Z. and Zou, H. and Rankin, R. and Sun, Y. X. and Chen, X. R. and Liu, Y. and Fu, S. Y. and Baker, D. N. and Spence, H. E. and Blake, J. B. and Reeves, Geoffrey D. and Claudepierre, S. G.},
abstractNote = {In this study we focus on the radiation belt dynamics driven by the geomagnetic storms during September 2017. Besides the long-lasting three-belt structures of ultrarelativistic electrons (>2 MeV, existing for tens of days), which has been studied intensively during the Van Allen Probe era, it is found that magnetospheric electrons of hundreds of keVs can also have three-belt structures at similar L extent during storm time. Measurements of 500–800 keV electrons from MagEIS instrument onboard Van Allen Probes show double-peaked (L = 3.5 and 4.5, respectively) flux-versus-L-shell profile in the outer belt, which lasted for 2–3 days. During the time interval of such transient three-belt structure, the energy-versus-L spectrogram shows novel distributions differing from both “S-shaped” and “V-shaped” spectrograms reported previously. Such peculiar distribution also illustrates the energy-dependent occurrence of the three-belt profile. Furthermore, the gradual formation of “reversed energy spectrum” at L ~ 3.5 also indicates that hiss scattering inside the plasmapause contributed to the fast decay of sub-MeV remnant belt.},
doi = {10.1029/2020ja028031},
journal = {Journal of Geophysical Research. Space Physics},
number = 9,
volume = 125,
place = {United States},
year = {Thu Aug 27 00:00:00 EDT 2020},
month = {Thu Aug 27 00:00:00 EDT 2020}
}
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