Journal article
Quantifying the relative contributions of substorm injections and chorus waves to the rapid outward extension of electron radiation belt
Journal of geophysical research. Space physics, Vol.119(12), pp.10,023-10,040
12/2014
DOI: 10.1002/2014JA020709
Abstract
We study the rapid outward extension of the electron radiation belt on a timescale of several hours during three events observed by Radiation Belt Storm Probes and Time History of Events and Macroscale Interactions during Substorms satellites and particularly quantify the contributions of substorm injections and chorus waves to the electron flux enhancement near the outer boundary of radiation belt. A comprehensive analysis including both observations and simulations is performed for the first event on 26 May 2013. The outer boundary of electron radiation belt moved from L = 5.5 to L > 6.07 over about 6 h, with up to 4 orders of magnitude enhancement in the 30 keV to 5 MeV electron fluxes at L = 6. The observations show that the substorm injection can cause 100% and 20% of the total subrelativistic (∼0.1 MeV) and relativistic (2–5 MeV) electron flux enhancements within a few minutes. The data-driven simulation supports that the strong chorus waves can yield 60%–80% of the total energetic (0.2–5.0 MeV) electron flux enhancement within about 6 h. Some simple analyses are further given for the other two events on 2 and 29 June 2013, in which the contributions of substorm injections and chorus waves are shown to be qualitatively comparable to those for the first event. These results clearly illustrate the respective importance of substorm injections and chorus waves for the evolution of radiation belt electrons at different energies on a relatively short timescale.
Details
- Title: Subtitle
- Quantifying the relative contributions of substorm injections and chorus waves to the rapid outward extension of electron radiation belt
- Creators
- Zhenpeng Su - Chinese Academy of SciencesC. A Kletzing - University of IowaHui Zhu - Chinese Academy of SciencesW. S Kurth - University of IowaFuliang Xiao - Changsha University of Science and TechnologyG. B Hospodarsky - University of IowaHuinan Zheng - Chinese Academy of SciencesD. N Baker - University of Colorado BoulderYuming Wang - University of Science and Technology of ChinaQ.-G Zong - Peking UniversityZhaoguo He - Chinese Academy of SciencesChao Shen - Chinese Academy of SciencesMin Zhang - University of Science and Technology of ChinaShui Wang - University of Science and Technology of ChinaH. E Spence - University of New HampshireG. D Reeves - Los Alamos National LaboratoryH. O Funsten - Los Alamos National LaboratoryJ. B Blake - The Aerospace Corporation
- Resource Type
- Journal article
- Publication Details
- Journal of geophysical research. Space physics, Vol.119(12), pp.10,023-10,040
- Publisher
- Blackwell Publishing Ltd
- DOI
- 10.1002/2014JA020709
- ISSN
- 2169-9380
- eISSN
- 2169-9402
- Number of pages
- 18
- Grant note
- DOI: 10.13039/501100001809, name: National Natural Science Foundation of China, award: 41274169, 41274174, 41174125, 41131065, 41121003, 41074120, 41231066 and 41304134; DOI: 10.13039/501100002367, name: Chinese Academy of Sciences, award: KZCX2-EW-QN510 and KZZD-EW-01-4; DOI: 10.13039/501100012226, name: Fundamental Research Funds for the Central Universities, award: WK2080000031; name: JHU/APL contract, award: 921647 and 967399; name: NASA Prime contract, award: NAS5-01072; name: National Key Basic Research Special Foundation of China, award: 2011CB811403; name: Strategic Priority Research Program on Space Science of the Chinese Academy of Sciences, award: XDA04060201
- Language
- English
- Date published
- 12/2014
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984199769702771
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