Physics – Plasma Physics
Scientific paper
Oct 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aps..dppkm1005c&link_type=abstract
American Physical Society, 43rd Annual Meeting of the APS Division of Plasma Physics October 29 - November 2, 2001 Long Beach, C
Physics
Plasma Physics
Scientific paper
Measurements of scattering of radio waves passing through the solar wind and other astrophysical plasmas can be used to probe the density fluctuations associated with MHD turbulence. The density is a passive scalar so radio measurements cannot directly measure the energy spectrum, but they can strongly constrain theoretical models of the turbulence. Radio observations are unique in their ability to probe anisotropy because radio interferometer arrays used for imaging astronomical sources are ideal for measuring scattering. These show very anisotropic structure near the Sun, and the axial ratio decreases rapidly with solar distance. Radio arrays can also be used to measure the velocity distribution, and such measurements suggest that the density microstructure is caused by compressive MHD waves. Measurements allow the oblique Alfven wave and the slow magneto-acoustic mode, but rule out the fast magneto-acoustic mode. Once the modes are identified the measured density fluctuations provide an estimate of the energy spectra.
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