Prompt enhancement of the Earth's outer radiation belt due to substorm electron injections
Abstract
Here, we present multipoint simultaneous observations of the near-Earth magnetotail and outer radiation belt during the substorm electron injection event on 16 August 2013. Time History of Events and Macroscale Interactions during Substorms A in the near-Earth magnetotail observed flux-enhanced electrons of 300 keV during the magnetic field dipolarization. Geosynchronous orbit satellites also observed the intensive electron injections. Located in the outer radiation belt, RBSP-A observed enhancements of MeV electrons accompanied by substorm dipolarization. The phase space density (PSD) of MeV electrons at L* ~5.4 increased by 1 order of magnitude in 1 h, resulting in a local PSD peak of MeV electrons, which was caused by the direct effect of substorm injections. We also detected an enhanced MeV electrons in the heart of the outer radiation belt within 2 h, which may be associated with intensive substorm electron injections and subsequent local acceleration by chorus waves. Multipoint observations have shown that substorm electron injections not only can be the external source of MeV electrons at the outer edge of the outer radiation belt (L* ~5.4) but also can provide the intensive seed populations in the outer radiation belt. These initial higher-energy electrons from injection can reach relativistic energy muchmore »
- Authors:
-
- Shandong Univ., Weihai (China). Inst. of Space Sciences
- Univ. of New Hampshire, Durham, NH (United States). Space Science Center, Dept. of Physics
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Univ. of Science adn Technology of China, Hefei (China). Dept. of Geophysics and Planetary Sciences
- Univ. of Colorado, Boulder, CO (United States). Lab. for Atmospheric and Space Research
- Aerospace Corporation, Los Angeles, CA (United States)
- Univ. of Minnesota, Minneapolis, MN (United States). School of Physics and Astronomy
- Publication Date:
- Research Org.:
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1402590
- Report Number(s):
- LA-UR-15-27235
Journal ID: ISSN 2169-9380; TRN: US1702996
- Grant/Contract Number:
- AC52-06NA25396
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Geophysical Research. Space Physics
- Additional Journal Information:
- Journal Volume: 121; Journal Issue: 12; Journal ID: ISSN 2169-9380
- Publisher:
- American Geophysical Union
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 58 GEOSCIENCES; Heliospheric and Magnetospheric Physics
Citation Formats
Tang, C. L., Zhang, J. -C., Reeves, G. D., Su, Z. P., Baker, D. N., Spence, H. E., Funsten, H. O., Blake, J. B., and Wygant, J. R. Prompt enhancement of the Earth's outer radiation belt due to substorm electron injections. United States: N. p., 2016.
Web. doi:10.1002/2016JA023550.
Tang, C. L., Zhang, J. -C., Reeves, G. D., Su, Z. P., Baker, D. N., Spence, H. E., Funsten, H. O., Blake, J. B., & Wygant, J. R. Prompt enhancement of the Earth's outer radiation belt due to substorm electron injections. United States. https://doi.org/10.1002/2016JA023550
Tang, C. L., Zhang, J. -C., Reeves, G. D., Su, Z. P., Baker, D. N., Spence, H. E., Funsten, H. O., Blake, J. B., and Wygant, J. R. Sat .
"Prompt enhancement of the Earth's outer radiation belt due to substorm electron injections". United States. https://doi.org/10.1002/2016JA023550. https://www.osti.gov/servlets/purl/1402590.
@article{osti_1402590,
title = {Prompt enhancement of the Earth's outer radiation belt due to substorm electron injections},
author = {Tang, C. L. and Zhang, J. -C. and Reeves, G. D. and Su, Z. P. and Baker, D. N. and Spence, H. E. and Funsten, H. O. and Blake, J. B. and Wygant, J. R.},
abstractNote = {Here, we present multipoint simultaneous observations of the near-Earth magnetotail and outer radiation belt during the substorm electron injection event on 16 August 2013. Time History of Events and Macroscale Interactions during Substorms A in the near-Earth magnetotail observed flux-enhanced electrons of 300 keV during the magnetic field dipolarization. Geosynchronous orbit satellites also observed the intensive electron injections. Located in the outer radiation belt, RBSP-A observed enhancements of MeV electrons accompanied by substorm dipolarization. The phase space density (PSD) of MeV electrons at L* ~5.4 increased by 1 order of magnitude in 1 h, resulting in a local PSD peak of MeV electrons, which was caused by the direct effect of substorm injections. We also detected an enhanced MeV electrons in the heart of the outer radiation belt within 2 h, which may be associated with intensive substorm electron injections and subsequent local acceleration by chorus waves. Multipoint observations have shown that substorm electron injections not only can be the external source of MeV electrons at the outer edge of the outer radiation belt (L* ~5.4) but also can provide the intensive seed populations in the outer radiation belt. These initial higher-energy electrons from injection can reach relativistic energy much faster. Furthermore, these observations also provide evidence that enhanced substorm electron injections can explain rapid enhancements of MeV electrons in the outer radiation belt.},
doi = {10.1002/2016JA023550},
journal = {Journal of Geophysical Research. Space Physics},
number = 12,
volume = 121,
place = {United States},
year = {Sat Dec 17 00:00:00 EST 2016},
month = {Sat Dec 17 00:00:00 EST 2016}
}
Web of Science
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