Preliminary results of dual-frequency radio occultation measurements of the daytime ionosphere of Venus by the Venera 9 and Venera 10 satellites

Details Preliminary results of dual-frequency radio occultation measurements of the daytime ionosphere of Venus by the Venera 9 and Venera 10 satellites Preliminary results of dual-frequency radio occultation measurements of the daytime ionosphere of Venus by the Venera 9 and Venera 10 satellites

Nov 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976kosis..14..819a&link_type=abstract

Kosmicheskie Issledovaniia, vol. 14, Nov.-Dec. 1976, p. 819-823. In Russian.

Physics

3

Ionospheric Electron Density, Planetary Ionospheres, Radio Occultation, Venera Satellites, Venus Atmosphere, Daytime, Solar Position, Time Response, Vertical Distribution, Zenith

Scientific paper

Radio occultation experiments were performed by space probes emerging from behind the disk of Venus. Two signals at 8 cm and 32 cm were received on earth by a dual-channel Doppler interferometer. Data processing consisted in obtaining the reduced frequency difference as a function of time. Analysis of these curves yielded profiles of the electron concentration in the Venusian atmosphere for different solar zenith angles. On November 23, 1975, at a solar zenith angle of 85 deg, the main ionization peak of 185,000 per cu cm was recorded at 135 km altitude. An anomaly was detected in the dependence of the altitude of the main ionization peak on illumination conditions: the altitude of the maximum decreased with increasing solar zenith angle, contrary to theoretical predictions.

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