A kinetic theory of energetic particle transport in intermediate-scale compressive velocity fluctuations associated with ion-acoustic waves

Details A kinetic theory of energetic particle transport in intermediate-scale compressive velocity fluctuations associated with ion-acoustic waves A kinetic theory of energetic particle transport in intermediate-scale compressive velocity fluctuations associated with ion-acoustic waves

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsh11c1122l&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SH11C-1122

Physics

2149 Mhd Waves And Turbulence, 2152 Pickup Ions, 7859 Transport Processes, 7867 Wave/Particle Interactions

Scientific paper

Linear Vlasov kinetic theory indicates that ion-acoustic waves might be weakly damped at low latitudes in the solar wind in a propagation direction along the background magnetic field. The existence of a field-aligned ion-acoustic mode is also supported by nearly incompressible MHD theory of the solar wind. A kinetic pitch-angle dependent transport theory was developed to explore how energetic charged particles respond to the small-amplitude compressive intermediate-scale velocity fluctuations associated with undamped ion-acoustic waves propagating along the large-scale magnetic field. Note that the theory is extended beyond standard quasi-linear theory in the sense that it is assumed in the theory that the particles are already scattering on small-scale MHD fluctuations when interacting with intermediate-scale velocity fluctuations. This coupling between small and intermediate scales in the limit of nearly isotropic particle distributions results in compound parallel spatial diffusion with particle scattering taking place on both small and intermediate scales. Of interest is that the theory implies that diffusive compression particle acceleration can occur whereby suprathermal particles such as pickup ions might acquire a distribution function with a power law spectrum in the quiet low-latitude solar wind.

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