Development of pitch angle anisotropy and velocity diffusion of pickup ion shell distribution by solar wind turbulence

Details Development of pitch angle anisotropy and velocity diffusion of pickup ion shell distribution by solar wind turbulence Development of pitch angle anisotropy and velocity diffusion of pickup ion shell distribution by solar wind turbulence

Oct 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....9517085y&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 95, Oct. 1, 1990, p. 17085-17094. Research supported by CNPq and Conselho

Mathematics

Logic

9

Anisotropy, Ion Distribution, Ionic Diffusion, Magnetohydrodynamic Waves, Pitch (Inclination), Plasma Turbulence, Solar Wind, Bessel Functions, Green'S Functions

Scientific paper

The evolution of pitch angle anisotropy in initially isotropic spherical shell distribution of pickup ions subjected to a continuous influence of weak or moderate intrinsic solar wind turbulence is investigated using a physical model which assumes that the wave of the solar wind turbulence is propagating mainly in the direction parallel to the ambient magnetic field. It is shown that, because of the pitch angle dependence of the velocity diffusion process, a significant pitch angle anisotropy of pickup ion shell distribution develops in the early stage of the diffusion process. Although it is smeared out later on, the result can be of significant importance, especially if the pickup ion density is large, because the pitch angle anisotropy can excite collective instabilities and increase the wave level, thus accelerating the diffusion process.

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