Physics – Plasma Physics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm53a1347l&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SM53A-1347
Physics
Plasma Physics
[2772] Magnetospheric Physics / Plasma Waves And Instabilities, [2774] Magnetospheric Physics / Radiation Belts, [7829] Space Plasma Physics / Kinetic Waves And Instabilities, [7867] Space Plasma Physics / Wave/Particle Interactions
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 one-dimensional, self-consistent hybrid simulation model and are due to the growth of the Alfvén cyclotron instability driven by the ion temperature anisotropy, Ti⊥>Ti∥ (where the subscripts, ⊥ and ∥, 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. The present study has applications to relativistic electron dynamics in the terrestrial magnetosphere.
Gary Peter S.
Lemons Don S.
Liu Kaijian
Winske Dan
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