Physics – Plasma Physics
Scientific paper
Apr 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010jgra..11504204l&link_type=abstract
Journal of Geophysical Research, Volume 115, Issue A4, CiteID A04204
Physics
Plasma Physics
5
Space Plasma Physics: Wave/Particle Interactions (2483, 6984), Space Plasma Physics: Kinetic Waves And Instabilities, Magnetospheric Physics: Radiation Belts, Magnetospheric Physics: Plasma Waves And Instabilities (2471), Space Plasma Physics: Stochastic Phenomena (3235, 3265, 4475)
Scientific paper
Relativistic electron scattering by electromagnetic ion cyclotron (EMIC) fluctuations is studied using test particle computations coupled to the results of a hybrid simulation code. The enhanced EMIC fluctuations are derived from a 1-D, self-consistent hybrid simulation model and are due to the growth of the Alfvén cyclotron instability driven by the ion temperature anisotropy, Ti$\perp$ > Ti$\parallel$ (where the subscripts $\perp$ and $\parallel$ refer to directions perpendicular and parallel to the background magnetic field, respectively), in a magnetized, homogeneous, collisionless plasma with a single ion species. The test particle computations follow the motion of relativistic test electrons in the input EMIC fluctuations. The time evolution of the mean square pitch angle change of the test electrons is calculated and used to determine the pitch angle diffusion coefficient. Finally, the results are compared with quasi-linear diffusion theory. The diffusion coefficients given by the test particle computations agree with the ones from quasi-linear theory very well except for large-amplitude waves (δB/B0 ≥ 0.03 in the case presented, where δB is the wave magnetic field amplitude and B0 is the background magnetic field) when the weak turbulence approximation in quasi-linear theory breaks down. Quasi-linear theory overestimates the pitch angle diffusion coefficient for large-amplitude waves and may, consequently, overestimate the pitch angle diffusion of relativistic electrons in the radiation belts at high L values.
Gary Peter S.
Lemons Don S.
Liu Kaijun
Winske Dan
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