About the study of the radio wave propagation in the turbulent solar plasma with Mars-2, 7 and Venera 10

Details About the study of the radio wave propagation in the turbulent solar plasma with Mars-2, 7 and Venera 10 About the study of the radio wave propagation in the turbulent solar plasma with Mars-2, 7 and Venera 10

Sep 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977prag.iafcq....i&link_type=abstract

International Astronautical Federation, International Astronautical Congress, 28th, Prague, Czechoslovakia, Sept. 25-Oct. 1, 197

Astronomy and Astrophysics

Astronomy

Plasma Turbulence, Radio Transmission, Shock Waves, Solar Wind, Spaceborne Astronomy, Wave Propagation, Electron Density (Concentration), Mars Probes, Radio Spectra, Venera Satellites

Scientific paper

Radio-wave propagation in the solar-wind plasma was investigated before and after Mars-2, Mars-7, and Venera-10 superior conjunction. It is found that the moving turbulent solar-wind plasma produces amplitude and frequency fluctuations and spectral broadening of monochromatic radio waves. When the sun-earth-spacecraft angle decreases from 6 to 0.6 deg, the bandwith of spectral broadening increases from 0.3 Hz to 330 Hz. The region from 2.5 to 4 deg is specific since the bandwith of spectral broadening is independent of sun-earth-spacecraft angle. The spectrum of frequency fluctuations is a power law with an index of 0.7 + or - 0.2. The temporal frequency spectra of the amplitude have two distinct regions. In the low-frequency region the spectral density is approximately constant. The high-frequency portion of the amplitude spectrum follows a power law with an index of 2.8 + or 0.4. The turbulence characteristics of the solar-wind plasma are determined from the experimental data obtained. The three-dimensional electron-density spectrum is found to be close to the Kolmogorov-Oboukhov spectrum. The solar-wind density fluctuations decline very steeply with heliocentric distance, but in the distance interval from 7 million to 12 million km there is a region of enhanced turbulence which could be caused by blast waves.

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