Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...123..207s&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 123, no. 2, July 1983, p. 207-215.
Astronomy and Astrophysics
Astronomy
56
Magnetohydrodynamic Turbulence, Radio Spectra, Scintillation, Solar Wind Velocity, Anisotropic Fluids, Centimeter Waves, Distance, Electron Density (Concentration), Power Spectra, Radio Sources (Astronomy)
Scientific paper
The solar wind mean velocity, random velocity, and turbulence spectrum at solar distances from 5 to 100 solar radii are estimated using observations of the interplanetary scintillation of cosmic radio sources. The data were taken during September and October of 1974, a period when the corona and the solar wind were particularly stable. During this period the shape of the electron density spectrum was well modeled by a power-law for which the exponent increases abruptly at some 'break' wavenumber. The break in this two-exponent model increases with decreasing solar distance. The random velocity is insignificant at distances greater than 40 solar radii, but increases rapidly with decreasing distance, approaching the mean velocity by 20 solar radii. The mean velocity increases from 200 to 300 km/s between 10 and 30 solar radii at low latitudes and is significantly higher at high latitudes.
Bourgois Gabriel
Coles William A.
Scott Susannah L.
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