Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...210..593w&link_type=abstract
Astrophysical Journal, vol. 210, Dec. 1, 1976, pt. 1, p. 593-602.
Astronomy and Astrophysics
Astronomy
19
Interplanetary Medium, Plasma Density, Plasma Turbulence, Radio Observation, Solar Wind, Spectral Line Width, Density Distribution, Fluctuation Theory, Magnetohydrodynamic Stability, Pioneer 6 Space Probe, Radio Spectra, Scintillation, Spaceborne Astronomy, Spectrum Analysis
Scientific paper
Spectral broadening of monochromatic radio waves by density fluctuations near the sun is analyzed using the parabolic equation method. Application of the analysis to the 1968 Pioneer-6 spectral broadening observations yields indirect measurements of the density spectrum within 14 solar radii of the sun. For spatial wavenumbers of at least 0.0084 inverse km, the three-dimensional density spectrum is found to be close to the Kolmogorov spectrum (power law with spectral index of 11/3) and is consistent with interplanetary-scintillation and in situ spacecraft measurements farther from the sun. The magnitude of the density spectrum increases, but its shape remains the same during 'solar events' marked by increases in bandwidth.
Ishimaru Akira
Woo Richard
Yang F.-C.
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