Precipitation Loss and Nonlinear Acceleration of Broadband Energetic Electrons by Whistler Chorus Waves

English Abstract:

The electron radiation belts, especially the outer radiation belt, have intense and rapid variation during geomagnetic storms. Whistler chorus wave is a plausible candidate to explain the flux variation in the heart of the outer belt through wave-particle interactions. While the quasi-linear model has been used to describe the wave-particle interactions so far, it has been proposed that nonlinear properties of whistler chorus elements can influence on the flux variation through the nonlinear scattering process, which cannot be described in the quasi-linear model. This study using test particle simulation code GEMSIS-RBW conducts electron precipitation loss and acceleration with the nonlinear scattering process by whistler chorus elements in the dipole magnetic field model. The simulations show that the broadband energetic electrons can be scattered by whistler chorus elements propagating from the magnetic equator to high magnetic latitudes. We will discuss precipitation flux of electrons in broadband energy range between keV and MeV, and influences of the nonlinear scattering process on the flux variation. The simulation studies would be applied to understand observation data from future mission such as ERG.