Preliminary results of narrow-band photometric probing of the cloud layer of Venus in the spectral range 0.80-0.87 micron on the Venera-9 and Venera-10 descent vehicles

Details Preliminary results of narrow-band photometric probing of the cloud layer of Venus in the spectral range 0.80-0.87 micron on the Venera-9 and Venera-10 descent vehicles Preliminary results of narrow-band photometric probing of the cloud layer of Venus in the spectral range 0.80-0.87 micron on the Venera-9 and Venera-10 descent vehicles

Sep 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976kosis..14..743m&link_type=abstract

Kosmicheskie Issledovaniia, vol. 14, Sept.-Oct. 1976, p. 743-757. In Russian.

Astronomy and Astrophysics

Astronomy

5

Astronomical Photometry, Descent Trajectories, Near Infrared Radiation, Venera Satellites, Venus Clouds, Albedo, Atmospheric Models, Atmospheric Scattering, Light Scattering, Planetary Atmospheres, Satellite-Borne Instruments, Scattering Coefficients, Vertical Distribution

Scientific paper

The paper describes the photometer with narrow filters aboard the Venera 9 and 10 spacecraft for measuring scattered solar radiation and discusses some measurements obtained by them. On the descent segment from 64 to 34 km, the instrument recorded the ratio of the intensity in H2O bands and in CO2 bands to the intensity in the continuous spectrum. A characteristic feature of the measurements is the sharp drop in the magnitudes of these two ratios at about 40 km. The results indicate that the main cloud layer with scattering coefficient of about 0.00001 per cm and particle concentration of about 200 per cu cm is situated above 50 km. In the range 30-50 km the scattering coefficient is 2-3 times smaller. The cloud layer consists of individual compact formations, the dimensions of which lie in the range from several hundreds of meters to several kilometers. The relative abundance H2O/CO2 is about 0.001 in the range 25-45 km.

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