An observational limit to the amplitude of Alfven waves in the solar wind and comparison with an acceleration model

Details An observational limit to the amplitude of Alfven waves in the solar wind and comparison with an acceleration model An observational limit to the amplitude of Alfven waves in the solar wind and comparison with an acceleration model

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jgr....9719139c&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 97, no. A12, p. 19,139-19,148.

Physics

12

Acceleration (Physics), Amplitude Distribution Analysis, Extraterrestrial Radio Waves, Magnetohydrodynamic Waves, Solar Limb, Solar Wind Velocity, Density Distribution, Electron Density (Concentration), Flow Velocity, Velocity Distribution

Scientific paper

Measurements of angular scattering of cosmic radio sources observed near the solar limb indicate that the density microstructure can be highly anisotropic (Armstrong et al., 1990). Here we point out that Alfven waves, which are known to be present in the solar wind, will tend to isotropize the angular scattering measurements. Thus such observations set an upper bound on the amplitude of Alfven waves in the scattering region. Recently measurements of velocity versus distance were made near the sun. In about half of the observed streams, the velocity profiles were found to be consistent with an MHD model of the solar wind in which Alfven waves are used to increase the flow velocities (Coles et al., 1991). In this paper we demonstrate that the Alfven wave amplitudes necessary to match the measured velocities are consistent with the bounds derived here from angular scattering observations.

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