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Title: Particle simulations of whistler-mode rising-tone emissions triggered by waves with different amplitudes
Authors: Hikishima, Mitsuru
Omura, Yoshiharu  kyouindb  KAKEN_id
Keywords: chorus
electron scattering
nonlinear wave growth
particle simulation
triggered emission
Issue Date: Apr-2012
Publisher: AMER GEOPHYSICAL UNION
Journal title: JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
Volume: 117
Issue: A4
Thesis number: A04226
Abstract: We perform self-consistent electromagnetic particle simulations to analyze whistler-mode triggered emissions in the magnetosphere. The whistler-mode triggering waves with different wave amplitudes and a constant frequency are injected at the equator. With triggering wave amplitudes greater than the threshold for the nonlinear wave growth, rising-tone emissions are successfully excited near the equator. The detailed time evolutions of amplitudes and frequencies of the rising-tone emissions show similar development. A recent theoretical study found the optimum amplitude of triggering waves for rising-tone emissions. The optimum amplitude condition is confirmed by the simulations. A triggering wave with an amplitude much greater than the optimum amplitude cannot trigger a rising emission. In a process where triggered emissions develop, phase-organized resonant electrons clearly appear in the velocity-phase space, contributing to the nonlinear wave growth. The simulation study shows that amplitudes and frequency sweep rates of triggered emissions do not depend on the amplitude of a triggering wave.
Rights: ©2012. American Geophysical Union.
URI: http://hdl.handle.net/2433/163426
DOI(Published Version): 10.1029/2011ja017428
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