Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm33a1748k&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SM33A-1748
Physics
2720 Energetic Particles: Trapped, 2730 Magnetosphere: Inner, 2772 Plasma Waves And Instabilities (2471), 2788 Magnetic Storms And Substorms (7954), 7867 Wave/Particle Interactions (2483, 6984)
Scientific paper
We study the properties of the whistler-mode chorus wave generation by a self-consistent particle simulation using an electron hybrid model. Recently we showed by the simulation that chorus emissions with rising tones are successively generated from the magnetic equator. For the generation mechanism of chorus emissions, the nonliear wave growth theory has been proposed by Omura et al. (2008) showing that the specific wave phase variation satisfying the maximum resonant current anti-parallel to the wave electric field undergoes significant amplification due to the effect of the selective nonlinear growth. Based on the proposed theory, the frequency sweep-rate of a chorus element is related to the wave amplitude at the saturation level of the instability driven by anisotropic velocity distribution of energetic electrons. In the present study, we performed simulations so as to discuss the validation of the theory of the chorus generation process. Simulation results show that the saturation level of the linear wave growth varied proportional to the assumed number density of energetic electrons. We estimated the frequency sweep-rate theoretically using the obtained satulation level and found that the estimated sweep-rates are consistent with those of chorus elements observed in the simulation results. The result of the present study serves an important clue in understanding the generation mechanism of chorus emissions and validates the proposed nonlinear wave growth theory.
Katoh Yuto
Omura Yuji
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