Acceleration of Suprathermal Tails in the Solar Wind

Details Acceleration of Suprathermal Tails in the Solar Wind Acceleration of Suprathermal Tails in the Solar Wind

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agusmsh41b..04f&link_type=abstract

American Geophysical Union, Spring Meeting 2008, abstract #SH41B-04

Physics

2114 Energetic Particles (7514), 2164 Solar Wind Plasma

Scientific paper

Suprathermal particles are ubiquitously present in the solar wind, with energies typically from ~1 keV/nucleon to ~a few MeV/nucleon. Remarkably, the suprathermal particles exhibit a common spectral shape in many different circumstances; the distribution function is a power law in particle speed, with spectral index of -5. A theory is presented in which the particles are accelerated in compressional turbulence. The theory describes the time evolution of the spectrum to its equilibrium form and predicts the high-speed cutoff on the acceleration. The theory can be applied to acceleration in the supersonic solar wind near Earth and to the acceleration of the Anomalous Cosmic Rays in the heliosheath.

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