Physics – Plasma Physics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm13b2051w&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SM13B-2051
Physics
Plasma Physics
[7829] Space Plasma Physics / Kinetic Waves And Instabilities, [7867] Space Plasma Physics / Wave/Particle Interactions
Scientific paper
Whistler mode chorus may play an important role in radiation belt electron acceleration and pitch angle scattering loss. Thus far self-consistent simulations have been restricted to one-dimension and propagation parallel to the background magnetic field^1, although observations of the largest amplitude whistlers have been highly oblique^2. We perform two dimensional hybrid code simulations of oblique whistler chorus waves in dipole coordinates to determine their evolution and distribution with respect to space, frequency and wave vector. Our hybrid code uses the particle in cell technique in generalized orthogonal coordinates with various boundary conditions. It has fourth order accuracy in space and second order accuracy in time. The particles are advanced using the full Lorentz force equation neglecting the displacement current to eliminate light waves. The initial particle distribution can be obtained from an anisotropic MHD equilibrium code. We simulate oblique whistler chorus in the limit of large plasma frequency/electron gyrofrequency ratio and small wave frequency/electron gyrofrequency ratio. We use energetic particles (ring current electrons) to stimulate the instability, a higher density population of relatively cold electrons, an even higher density population of cold inertialess electrons, and a fixed background of ions. In the real system, the parallel electric field will be canceled on the timescale of whistler waves by the plasma oscillations, while in our system it is cancelled by the free movement of the inertialess electrons. Our model will be more accurate for lower band chorus (wave frequency smaller than half the electron gyrofrequency). Since lower band chorus is dominant in the space observations, this is not a major limitation. 1 Katoh and Omura, JGR, 2007 2 Cattell et al., GRL, 2008.
Denton Richard E.
Hudson Mary K.
Wu Seongho
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