globalchange  > 气候减缓与适应
DOI: 10.1002/2017JA024801
Scopus记录号: 2-s2.0-85041483155
论文题名:
Dependence of Generation of Whistler Mode Chorus Emissions on the Temperature Anisotropy and Density of Energetic Electrons in the Earth's Inner Magnetosphere
作者: Katoh Y.; Omura Y.; Miyake Y.; Usui H.; Nakashima H.
刊名: Journal of Geophysical Research: Space Physics
ISSN: 21699380
出版年: 2018
卷: 123, 期:2
起始页码: 1165
结束页码: 1177
语种: 英语
英文关键词: numerical experiments ; wave-particle interaction ; whistler mode chorus
英文摘要: We carry out a series of self-consistent electron hybrid code simulations for the dependence of chorus generation process on the temperature anisotropy and density of energetic electrons in the Earth's inner magnetosphere. We use the same magnetic field gradient in the simulation system and different temperature anisotropy AT for the initial distribution of energetic electrons at the magnetic equator. We conduct 6 sets of simulations for different AT from 4 to 9, changing the initial number density Nh of energetic electrons at the equator in each set of simulations. By analyzing the spectra obtained in the simulation results, we identify chorus elements with rising tones in the results for higher Nh but no distinct chorus in smaller Nh. We compare the simulation results with estimations of the threshold and optimum amplitude proposed by the nonlinear wave growth theory. We find that the chorus generation processes reproduced in the simulation results are consistently explained by the theoretical estimates. We also compare the simulation results with linear growth rates for all simulation runs. We find clear disagreement between the spectral characteristics of reproduced chorus and the predictions by the linear theory. The present study clarifies that the spectra of chorus are essentially different from those predicted by the linear theory and are determined fully by nonlinear processes of wave-particle interactions in the chorus generation region. ©2018. American Geophysical Union. All Rights Reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114483
Appears in Collections:气候减缓与适应

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作者单位: Department of Geophysics, Graduate School of Science, Tohoku University, Sendai, Japan; Research Institute for Sustainable Humanosphere, Kyoto University, Kyoto, Japan; Graduate School of System Informatics, Kobe University, Kobe, Japan; Academic Center for Computing and Media Studies, Kyoto University, Kyoto, Japan

Recommended Citation:
Katoh Y.,Omura Y.,Miyake Y.,et al. Dependence of Generation of Whistler Mode Chorus Emissions on the Temperature Anisotropy and Density of Energetic Electrons in the Earth's Inner Magnetosphere[J]. Journal of Geophysical Research: Space Physics,2018-01-01,123(2)
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