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Title: Nonlinear spatiotemporal evolution of whistler mode chorus waves in Earth's inner magnetosphere
Authors: Summers, Danny
Omura, Yoshiharu  kyouindb  KAKEN_id
Miyashita, Yu
Lee, Dong-Hun
Keywords: chorus
nonlinear wave growth
numerical analysis
radiation belt
whistler mode wave
Issue Date: Sep-2012
Publisher: American Geophysical Union
Journal title: Journal of Geophysical Research: Space Physics
Volume: 117
Issue: A9
Thesis number: A09206
Abstract: We analyze the nonlinear evolution of whistler mode chorus waves propagating along a magnetic field line from their equatorial source. We solve wave evolution equations off the equator for the wave magnetic field amplitude and wave frequency, subject to boundary conditions at the equator comprising model "chorus equations" that describe the generation of a seed chorus element. The electron distribution function is assumed to evolve adiabatically along a field line. The wave profiles exhibit nonlinear convective growth followed by saturation. Convective growth is due to nonlinear wave trapping, and the saturation process is partly due to a combination of adiabatic effects and a decreasing resonant current with latitude. Notwithstanding computationally expensive full-scale kinetic simulations, our study appears to be the first to analyze the nonlinear evolution and saturation of whistler mode waves off the equator.
Rights: ©2012. American Geophysical Union.
DOI(Published Version): 10.1029/2012ja017842
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