Venera 9, 10 - Is there a dust ring around Venus

Details Venera 9, 10 - Is there a dust ring around Venus Venera 9, 10 - Is there a dust ring around Venus

Jul 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979p%26ss...27..951k&link_type=abstract

Planetary and Space Science, vol. 27, July 1979, p. 951-957.

Physics

2

Interplanetary Dust, Nightglow, Ring Structures, Venera Satellites, Venus Atmosphere, Herzberg Bands, Mass Distribution, Optical Thickness, Particle Density (Concentration), Particle Size Distribution, Venera 9 Satellite, Zodiacal Light, Venus, Venera 9, Venera 10, Spectrometers, Rings, Wavelengths, Scattering, Spectrum, Refractive Index, Mass, Density, Satellites, Rayleigh Scattering, Herzberg Bands, Atmosphere, Analysis, Particles, Zodiacal Light, Helios A, Mie Theory, Cosmic Dust, Diffraction, Nightglow,

Scientific paper

Spectrometric observations of Venus from four surveys carried out by Venera 9 and 10 orbiters under conditions favorable to the investigation of weak scattering objects are analyzed. Height profiles of the Venusian nightglow and data on its diurnal variation were obtained together with spectra representing the second system of O2 Herzberg bands. Observations carried out by Venera 10 on December 30, 1975 suggest the presence of a dust layer at sighting heights of 100 to 700 km. The spectrum of dust scattering is represented by a power function with an index ranging from -2.1 at 100 km to -1.3 at 500 km. A method for calculating the optical thickness, density and size distribution of dust particles from the scattering spectra is described. The maximum optical thickness in the direction perpendicular to the plane of the ring is 4 times 10 to the minus 6th. Assuming the geometric thickness to be 100 km, the radial optical thickness is calculated to be 0.7 times 10 to the minus 5 at 5000 A and the maximum ring density is 10 to the minus 17th g/cu cm. It is suggested that the ring arose from a satellite destroyed by temperature effects and by plasma fluxes.

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