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Quantifying the relative contributions of substorm injections and chorus waves to the rapid outward extension of electron radiation belt

Zhenpeng SuCAS Key Laboratory of Geospace Environment, Department of Geophysics and Planetary Sciences University of Science and Technology of China Hefei ChinaHui ZhuCAS Key Laboratory of Geospace Environment, Department of Geophysics and Planetary Sciences University of Science and Technology of China Hefei ChinaFuliang XiaoSchool of Physics and Electronic Sciences Changsha University of Science and Technology Changsha ChinaHuinan ZhengCAS Key Laboratory of Geospace Environment, Department of Geophysics and Planetary Sciences University of Science and Technology of China Hefei ChinaYuming WangCAS Key Laboratory of Geospace Environment, Department of Geophysics and Planetary Sciences University of Science and Technology of China Hefei ChinaQiugang ZongInstitute of Space Physics and Applied Technology Peking University Beijing ChinaZhaoguo HeCenter for Space Science and Applied Research Chinese Academy of Sciences Beijing ChinaChao ShenState Key Laboratory of Space Weather, Center for Space Science and Applied Research Chinese Academy of Sciences Beijing ChinaMin ZhangCAS Key Laboratory of Geospace Environment, Department of Geophysics and Planetary Sciences University of Science and Technology of China Hefei ChinaShui WangCAS Key Laboratory of Geospace Environment, Department of Geophysics and Planetary Sciences University of Science and Technology of China Hefei ChinaC. A. KletzingDepartment of Physics and Astronomy University of Iowa Iowa City Iowa USAW. S. KŭrthDepartment of Physics and Astronomy University of Iowa Iowa City Iowa USAG. B. HospodarskyDepartment of Physics and Astronomy University of Iowa Iowa City Iowa USAH. E. SpenceInstitute for the Study of Earth, Oceans, and Space University of New Hampshire Durham New Hampshire USAG. D. ReevesSpace Science and Applications Group Los Alamos National Laboratory Los Alamos New Mexico USAH. O. FunstenISR Division Los Alamos National Laboratory Los Alamos New Mexico USAJ. B. BlakeThe Aerospace Corporation Los Angeles California USAD. N. BakerLaboratory for Atmospheric and Space Physics University of Colorado Boulder Boulder Colorado USA

2014en

ABI

Annotatsiya

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.

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Identifikatorlar

DOI: 10.1002/2014ja020709

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