Physics
Scientific paper
May 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusmsh53a..01g&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SH53A-01
Physics
2134 Interplanetary Magnetic Fields, 2149 Mhd Waves And Turbulence (2752, 6050, 7836), 2164 Solar Wind Plasma
Scientific paper
It has long been known that the variance of solar wind magnetic field fluctuations is not isotropic, but rather tends to be axisymmetric with a minimum along the direction of the background magnetic field. The simple explanation for this is the observation is that the fluctuations consist of nearly incompressive Alfvén waves, but, in fact, linear Alfvén waves should have a minimum variance along the radial direction. Previous work has shown that to produce a minimum variance along the field when the background magnetic field is no longer in the radial direction inhomogeneities must be present and nonlinear interactions also appear necessary. Our previous simulations have shown the development of anisotropies, but not a systematic turning of the minimum variance direction toward the magnetic field direction. The resolutions used in the previous work may have been insufficient for strong nonlinear couplings to produce an alignment of the direction of minimum variance along the magnetic field. Here we present higher-resolution MHD simulations to examine the effectiveness of nonlinearities in controlling the minimum variance direction.
Goldstein Michel L.
Roberts Daniel A.
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