Statistics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.1708k&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #17.08; Bulletin of the American Astronomical Society, V
Statistics
Scientific paper
Intermittency of MHD turbulence can play important role for inhomogeneous heating of the interstellar gas. Strong intermittency can also affect the propagation and acceleration of cosmic rays. We report our recent studies on the intermittency of velocity field in the numerical simulations of 3D compressible MHD turbulence. We perform two types of velocity field separation: the first into incompressible and compressible parts performing the Helmholtz-Hodge decomposition and the second into Alfven, slow and fast modes using the Cho & Lazarian (2003) technique. For each resulting component we calculate two-point statistics which include longitudinal, transverse and total structure functions. We find that the turbulence intermittency is very different for different modes. They also depend on the system of reference in which the intermittency is studied. While the Alfven mode intermittency changes marginally with the Mach number, the intermittency of the fast mode is affected by the change of Mach number substantially larger. We show that observational studies of intermittencies may be an important tool for ISM turbulence studies.
Kowal Grzegorz
Lazarian Alex
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