Physics
Scientific paper
Dec 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979jgr....84.7288w&link_type=abstract
Journal of Geophysical Research, vol. 84, Dec. 1, 1979, p. 7288-7296.
Physics
82
Electron Density (Concentration), Power Spectra, Radio Scattering, Solar Wind, Spacecraft Communication, Doppler Effect, Particle Acceleration, Scintillation, Spectral Line Width
Scientific paper
Solar wind electron density power spectra in the solar equatorial region are inferred from observations of phase scintillations and spectral broadening made with the Viking, Helios, and Pioneer spacecraft. The heliocentric distance range covered is 2-215 solar radii and for some observations close to the sun the spectra extend to fluctuation frequencies as high as 100 Hz. For heliocentric distances of about 20 solar radii the equivalent spacecraft-measured one-dimensional density spectrum is well modeled by a single power law in the frequency range 0.0001-0.05 Hz. The flattening of the density spectrum within 20 solar radii is presumably associated with energy deposition in the near-sun region and acceleration of the solar wind.
Armstrong John W.
Woo Richard
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