Pitch Angle Diffusion of Energetic Particles by Large Amplitude MHD Waves

Details Pitch Angle Diffusion of Energetic Particles by Large Amplitude MHD Waves Pitch Angle Diffusion of Energetic Particles by Large Amplitude MHD Waves

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003icrc....6.3709h&link_type=abstract

Proceedings of the 28th International Cosmic Ray Conference. July 31-August 7, 2003. Trukuba, Japan. Under the auspices of the I

Physics

1

Scientific paper

We discuss some fundamental properties of pitch angle diffusion of charged particles by MHD waves by performing test particle simulations. Even at a moderate normalized turbulence level (turbulence magnetic field energy density normalized to the background field energy density ˜ 0.1), both the mirroring and the resonance broadening effects become important, and the diffusion starts to deviate substantially from the standard quasi-linear diffusion model. Some other outstanding consequences of the finite amplitude of the waves are the dependence of the diffusion coefficients on spatial and temporal scales, and the effect of phase coherence among MHD waves, as evidenced by recent spacecraft data analysis.

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