Electromagnetic Ion Cyclotron Fluctuations and Fast Electron Scattering: Hybrid Simulations

Statistics – Computation

Scientific paper

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2730 Magnetosphere: Inner, 2731 Magnetosphere: Outer, 2772 Plasma Waves And Instabilities (2471), 7829 Kinetic Waves And Instabilities

Scientific paper

Two dimensional electromagnetic hybrid simulations in a magnetized, homogeneous, collisionless plasma with a single ion species yield enhanced electromagnetic ion cyclotron (EMIC) fluctuations due to the growth of the ion cyclotron instability driven by T⊥ i > T∥ i. The research described here addresses fundamental properties of such enhanced fluctuations, in preparation for future studies on their interaction with fast electrons, with the ultimate goal of understanding how EMIC wave-particle scattering leads to trapping and untrapping of relativistic electrons in the terrestrial magnetosphere. Self-consistent magnetic fluctuation spectra from the hybrid simulations will be used to examine the approximations often used in quasilinear theories of fast electron scattering by EMIC fluctuations. These approximations include the assumptions (1) that the fluctuation power spectrum has a Gaussian distribution in frequency, (2) that fluctuation dispersion is given by linear cold plasma theory, and (3) that the fluctuations propagate only parallel or antiparallel to the background magnetic field. We also will describe preliminary test particle computations intended to address the further quasilinear assumption (4) that the fluctuating fields are small enough in amplitude that the wave-particle interactions can be described by a Fokker-Planck-type diffusion equation.

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