Turbulence and Cosmic Ray Acceleration

Details Turbulence and Cosmic Ray Acceleration Turbulence and Cosmic Ray Acceleration

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.1709l&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #17.09; Bulletin of the American Astronomical Society, V

Astronomy and Astrophysics

Astronomy

Scientific paper

Both turbulence and cosmic rays exhibit power laws that spread over many decades. We analyze the problems that current theories of turbulence face in accounting for the interaction of turbulence and cosmic rays. We identify compressible motions as the major agent that enables efficient coupling of turbulence and cosmic rays. We consider both strong and weak turbulence, as well as super-Alfvenic turbulence, revisit the mechanisms of turbulent acceleration of cosmic rays. We establish conditions when the particular mechanisms dominate. In addition, we analyze a new technique termed Velocity Coordinate Spectrum (VCS) that enables observational studies of turbulence using Doppler-broadened spectroscopic lines. We discuss the feasibility of separating the compressible and incompressible components of turbulence and thus checking our theoretical constructions.

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