Physics
Scientific paper
Feb 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983ssrv...34..137q&link_type=abstract
(COSPAR, IAU, IUGG, IUPAP, and URSI, International Symposium on Progress in Solar-Terrestrial Physics, 5th, Ottawa, Canada, May
Physics
6
Energetic Particles, Interplanetary Space, Particle Acceleration, Particle Diffusion, Plasma Dynamics, Solar Wind, Charged Particles, Cyclotron Resonance, Diffusion Coefficient, Fokker-Planck Equation, Interplanetary Magnetic Fields, Longitudinal Waves, Shock Wave Propagation
Scientific paper
Particle data are related to studies evaluating energetic particle transport coefficients in interplanetary space. Diffusion coefficients based on IMF data are either derived from quasi-linear adiabatic theory, or this theory is corrected either for finite scattering near 90 deg pitch angle or by numerical techniques. Generally, the fitting of Fokker-Plank transport equation solutions yield parallel diffusion coefficients appearing larger than those given by theoretical estimates. Perpendicular diffusion is shown to be due to field line wandering and random drift motion effects. It is noted that energetic particles may gain energy from longitudinal waves and cyclotron resonance interactions. Some of the analytical and numerical estimates of the energy space diffusion coefficients reveal exceptional importance for statistical acceleration in interplanetary space.
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