Observations of field-aligned density fluctuations in the inner solar wind

Details Observations of field-aligned density fluctuations in the inner solar wind Observations of field-aligned density fluctuations in the inner solar wind

Aug 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...358..685a&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 358, Aug. 1, 1990, p. 685-692. Research supported by the National Radio Ast

Astronomy and Astrophysics

Astronomy

108

Density Distribution, Electron Density (Concentration), Field Aligned Currents, Radio Waves, Solar Wind, Wave Scattering, Density Measurement, Periodic Variations, Spatial Distribution, Very Large Array (Vla)

Scientific paper

This paper reports the results of radio wave scattering observations which show highly anisotropic density microstructure in the inner solar wind. These observations were made in October 1983 and 1985, using the National Radio Astronomy Observatory's Very Large Array. Heliocentric distances of the observations ranged from 2.2. to about 13 solar radii. The axial ratio of the density fluctuations, projected onto the plane of the sky, increased from about 4 at 10 solar radii to about 14 at 2.2 solar radii. The major axis appeared to be field aligned; that is, the irregularities were stretched out approximately along the radial. These results are, in general, consistent with the results of earlier observations. The present observations differ in that they were taken closer to the sun, they were sensitive to larger scale structures (up to about 35 km), and showed much higher anisotropy. Combining these data with previously taken data strongly indicates that the anisotropy is scale dependent; scales greater than 10 km appear to be more anisotropic than those less than 2 km.

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