Aniostropic kinetic dissipation in collisionless turbulent plasmas.

Details Aniostropic kinetic dissipation in collisionless turbulent plasmas. Aniostropic kinetic dissipation in collisionless turbulent plasmas.

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsh31a1651p&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SH31A-1651

Physics

2164 Solar Wind Plasma, 7846 Plasma Energization, 7863 Turbulence (4490)

Scientific paper

The nature of the collisionless dissipation at small scales in solar wind turbulence is a problem of critical importance. To gain some insight into the nature of the dissipation, we simulate the Orszag-Tang vortex using collisionless hybrid simulations. In magnetohydrodynamics this configuration leads rapidly to broadband turbulence. At small scales, differences from magnetohydrodynamics arise, as energy dissipates into heat almost exclusively through the magnetic field. A key result is that protons are heated preferentially in the plane perpendicular to the mean magnetic field, creating a proton temperature anisotropy as is observed in the corona and solar wind. In order to gain insight into the heating mechanism, the scaling properties of the dissipation are examined, as well as length and time spectra.

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