Microwave absorption characteristics of the clouds of Venus from Mariner 10 radio occultation

Details Microwave absorption characteristics of the clouds of Venus from Mariner 10 radio occultation Microwave absorption characteristics of the clouds of Venus from Mariner 10 radio occultation

Jun 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977cosp.meetv....k&link_type=abstract

COSPAR, Plenary Meeting, 20th, Tel Aviv, Israel, June 7-18, 1977, Paper. 6 p.

Computer Science

Mariner 10 Space Probe, Microwave Attenuation, Radio Occultation, Venus Clouds, Electromagnetic Absorption, Superhigh Frequencies, Ultrahigh Frequencies, Venus Atmosphere, Venus Radar Echoes

Scientific paper

Measurements of received signal strength at S-band (13 cm) and X-band (4.8 cm) wavelengths during the radio occultation of Mariner 10 by Venus on February 5, 1974, are examined in order to study the structure and composition of the absorbing medium. The frequency excursions of the signals are determined and used to obtain the structure of the refractive index in the lower atmosphere. Profiles of excess signal attenuation due to atmospheric scattering and absorption are presented which indicate that the X-band signal experienced much more absorption and was extinguished at about 50 km, while the S-band signal penetrated to about 42 km. The optical-depth data are inverted by means of a discrete inversion method to obtain the absorption coefficient for each band as a function of height, and the resulting absorption-coefficient profiles are compared with the attenuation at vertical incidence modeled from planetary radar and passive microwave observations of Venus. The absorption coefficients at the two wavelengths are employed to estimate the liquid content and composition of the microwave-absorbing cloud particles.

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