Open AccessFull particle simulation of whistler‐mode rising chorus emissions in the magnetosphere
Author(s) -
Hikishima M.,
Yagitani S.,
Omura Y.,
Nagano I.
Publication year - 2009
Publication title -
journal of geophysical research: space physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.67
H-Index - 298
eISSN - 2156-2202
pISSN - 0148-0227
DOI - 10.1029/2008ja013625
Subject(s) - magnetosphere , physics , whistler , equator , amplitude , computational physics , van allen radiation belt , geophysics , chorus , dispersion relation , electron , magnetic field , optics , latitude , quantum mechanics , astronomy , art , literature
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.