Liquid content of the lower clouds of Venus as determined from Mariner 10 radio occultation

Details Liquid content of the lower clouds of Venus as determined from Mariner 10 radio occultation Liquid content of the lower clouds of Venus as determined from Mariner 10 radio occultation

Jan 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979icar...37...51k&link_type=abstract

Icarus, vol. 37, Jan. 1979, p. 51-72.

Computer Science

2

Drops (Liquids), Mariner 10 Space Probe, Microwave Attenuation, Radio Occultation, Venus Clouds, Absorptance, Flyby Missions, Moisture Content, Sulfuric Acid, Superhigh Frequencies, Ultrahigh Frequencies, Venus Atmosphere, Water, Liquids, Clouds, Venus, Mariner 10, Absorption, Radio Occultations, Microwave, Atmosphere, Water, Concentrations, Wavelengths, Sulfuric Acid, Cloud Layers, Dielectric Constants

Scientific paper

S- and X-band radio occulation data obtained during the Mariner 10 flyby of Venus are analyzed to determine the effects of signal attenuation due to the clouds of Venus. The signal-amplitude data are corrected for errors introduced by spacecraft motion and antenna steering during the occultation, absorption-coefficient profiles are computed, and the liquid content of the Venusian clouds is estimated. Excess attenuation effects are found and ascribed to absorption by small liquid particles, consisting of a water-sulfuric acid mixture containing 75% + or - 25% sulfuric acid, in the clouds. Three absorbing cloud layers at respective heights of 68, 60, and 48 km are suggested by the X-band absorptivity profile, but only the 68- and 48-km layers are clearly indicated by the S-band profile. The relatively slow S-band absorption at 60 km is tentatively attributed to an unknown constituent that is much more absorbing in the X-band than in the S-band. The results are compared with nephelometer measurements performed at 0.9 micron by the Venera 9 and 10 probes.

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