期刊
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
卷 114, 期 -, 页码 -出版社
AMER GEOPHYSICAL UNION
DOI: 10.1029/2008JA013625
关键词
-
资金
- Ministry of Education, Science, Sports and Culture of Japan [20340135, 17GS0208]
- Grants-in-Aid for Scientific Research [20340135] Funding Source: KAKEN
We perform an electromagnetic full particle simulation to study the generation mechanism of VLF whistler-mode chorus emissions in the equatorial region of the magnetosphere. Parabolic variation of the static magnetic field is assumed as a model for the dipole magnetic field in the vicinity of the equator. We have cold thermal electrons and relatively low anisotropic hot electrons as plasma particles. In the initial phase, the amplitude growth of the incoherent whistler-mode waves is determined by the linear growth rate. When the wave amplitude reaches a certain level, it begins to grow more rapidly with a series of rising tone emissions consisting of coherent phase structures in the vicinity of the magnetic equator, and their wave packets propagate away form the magnetic equator. The frequency sweep rates of the excited rising tone elements decrease gradually. We find a distinct threshold for such a nonlinear wave growth generating the rising chorus-like elements. The relation between the wave amplitude and the frequency sweep rate of each element found in the simulation fully supports the nonlinear wave growth theory of chorus emissions.
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