Macro-scale instability of the ion shell distribution function in the divergent solar wind

Details Macro-scale instability of the ion shell distribution function in the divergent solar wind Macro-scale instability of the ion shell distribution function in the divergent solar wind

Sep 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004phpl...11.4290s&link_type=abstract

Physics of Plasmas, Volume 11, Issue 9, pp. 4290-4294 (2004).

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Magnetohydrodynamics And Plasmas, Laboratory Studies Of Space- And Astrophysical-Plasma Processes, Magnetohydrodynamic Waves, Fluctuation And Chaos Phenomena, Macroinstabilities, Nonlinear Phenomena: Waves, Wave Propagation, And Other Interactions, Transport Properties, Particle Emission, Solar Wind

Scientific paper

As a result of cyclotron interaction with Alfvén waves propagating from the sun, pitch angle diffusion of resonant particles takes place and a shell-like distribution function of resonant ions is formed at each distance from the sun. Stability of the solar wind ion shell-like distribution function with respect to excitation of waves at larger distances is addressed. It is shown in linear approximation, that in the case when the phase velocity of Alfvén waves decreases with distance, ions with shell distribution excite outward propagating Alfvén waves with smaller phase velocities when they advance to larger distances. The nonlinear dynamics of the wave spectrum as well as the evolution of the ion distribution function are studied. The characteristic spectrum at the high-frequency edge of the magnetohydrodynamic fluctuations is explained.

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