Physics – Plasma Physics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsh41c..08f&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #SH41C-08
Physics
Plasma Physics
[2114] Interplanetary Physics / Energetic Particles, [7514] Solar Physics, Astrophysics, And Astronomy / Energetic Particles, [7845] Space Plasma Physics / Particle Acceleration
Scientific paper
One of the more interesting discoveries in recent years has been the ubiquitous presence of suprathermal tails on the velocity distributions of ions in the solar wind, with a common spectral shape: a power law with spectral index of -5 when expressed as a distribution function. The common spectral shape occurs in the quiet solar wind far from shocks, in disturbed conditions particularly downstream from shocks, and throughout the heliosheath. The theory for the acceleration of these particles suggests that they should occur wherever there is an initial core distribution of particles with a sharp cutoff, above which particles can spatially diffuse, in the presence of compressional turbulence. These suprathermal tails certainly serve as the seed particles for any subsequent acceleration in the solar wind, and may determine the acceleration at shocks. The possibility that these suprathermal tails serve as the seed particles and influence subsequent acceleration in the solar corona will be discussed.
Fisk Len A.
Gloeckler George
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