Radio-wave fluctuations and turbulence in the nightside atmosphere of Venus from radio-occultation data obtained with the Venera 9 satellite

Details Radio-wave fluctuations and turbulence in the nightside atmosphere of Venus from radio-occultation data obtained with the Venera 9 satellite Radio-wave fluctuations and turbulence in the nightside atmosphere of Venus from radio-occultation data obtained with the Venera 9 satellite

Mar 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978kosis..16..285t&link_type=abstract

Kosmicheskie Issledovaniia, vol. 16, Mar.-Apr. 1978, p. 285-293. In Russian.

Computer Science

Sound

1

Atmospheric Turbulence, Night Sky, Radio Occultation, Venus Atmosphere, Amplitudes, Decimeter Waves, Inhomogeneity, Power Spectra, Venera Satellites

Scientific paper

Amplitude fluctuations of decimetric radio waves during propagation in the nightside Venusian atmosphere were studied in radio-occultation experiments performed with Venera 9. It is found that when the atmosphere was sounded, the radio-signal amplitude underwent a regular decrease due to refractive attenuation and random variations associated with atmospheric inhomogeneities. The data from five experiments indicate that the depth of random fluctuations in field intensity was greatest (amounting to 13%-18%) when the beam penetrated to distances of 62 and 48 km from the planet's surface. The frequency spectrum of the field-intensity fluctuations is described by a power law with a spectral index of 2.9 + or - 0.4, assuming that the spatial spectrum of refractive-index nonuniformities is also a power law and is similar to the theoretical Kolmogorov-Obukhov spectrum. It is shown that the inhomogeneities in the Venusian atmosphere are concentrated in two turbulent layers located at heights of 56 to 68 km and near 48 km.

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