Statistics – Computation
Scientific paper
Jun 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006spd....37.1602i&link_type=abstract
American Astronomical Society, SPD meeting #37, #16.02; Bulletin of the American Astronomical Society, Vol. 38, p.245
Statistics
Computation
Scientific paper
One of the most peculiar features of the fast solar wind is the preferential energization of heavy ions (those more massive than protons). Observations by UVCS/SOHO have shown that much of the preferential heating in coronal holes is in the perpendicular direction and takes place within 4 solar radii. The observed preferential acceleration naturally follows from this perpendicular heating in a radially decreasing magnetic field. We demonstrate that this perpendicular heating can result from the cyclotron resonant interaction of heavy ions with both inward and outward propagating ion cyclotron waves, yielding a form of second-order Fermi acceleration for thermal particles. This process is not available to protons, so it is inherently preferential to heavy ions. We will describe the physics of this process and discuss results from a computational model.
Isenberg Philip A.
Vasquez Bernard J.
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