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Exohiss wave enhancement following substorm electron injection in the dayside magnetosphere

Earth and Planetary Physics 2018年第5期2卷 359-370页

作者： ZhongLei Gao ZhenPeng Su FuLiang Xiao HuiNan Zheng YuMing Wang Shui Wang H. E. Spence G.D. Reeves D. N. Baker J. B. Blake H.O. Funsten School of Physics and Electronic Sciences Changsha University of Science and Technology Changsha 410004 China CAS Key Laboratory of Geospace Environment Department of Geophysics and Planetary Sciences University of Science and Technology of China HefeiAnhui 230026 China Collaborative Innovation Center of Astronautical Science and Technology University of Science and Technology of China Hefei 230026 China Mengcheng National Geophysical Observatory School of Earth and Space Sciences University of Science and Technology of China Hefei 230026 China Institute for the Study of Earth Oceans and Space University of New Hampshire Durham New Hampshire USA Space Science and Applications Group Los Alamos National Laboratory Los Alamos New Mexico USA Space Sciences Division New Mexico Consortium Los Alamos New Mexico USA Laboratory for Atmospheric and Space Physics University of Colorado Boulder Colorado USA The Aerospace Corporation Los Angeles California USA ISR Division Los Alamos National Laboratory Los Alamos New Mexico USA

Exohiss is a low-frequency structureless whistler-mode emission potentially contributing to the precipitation loss of radiation belt electrons outside the plasmasphere. Exohiss is usually considered the plasmaspheric hiss leaked out of the dayside ***, the evolution of exohiss after the leakage has not been fully understood. Here we report the prompt enhancements of exohiss waves following substorm injections observed by Van Allen Probes. Within several minutes, the energetic electron fluxes around 100 keV were enhanced by up to 5 times, accompanied by an up to 10-time increase of the exohiss wave power. These substorm-injected electrons are shown to produce a new peak of linear growth rate in the exohiss band(substorm-injected energetic electrons could amplify the preexisting exohiss waves.

关键词： exohiss substorm injection radiation belt whistler-mode instability

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