Preliminary results of the solar flux radiometer experiment aboard the Pioneer Venus multiprobe mission

Physics

Scientific paper

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Cloud Cover, Pioneer Venus Spacecraft, Radiometers, Solar Flux, Spaceborne Experiments, Venus Atmosphere, Heat Balance, Parachute Descent, Planetary Surfaces, Pressure Effects, Space Exploration, Venus, Photon Flux, Flux, Pioneer Venus, Radiometers, Atmosphere, Surface, Temperatures

Scientific paper

An understanding of the thermal balance of Venus requires a detailed knowledge of the amount of sunlight absorbed at various levels in its atmosphere and at the planet's surface. To obtain measurements of solar flux near the cloud tops where the sun is still visible from a spinning probe suspended beneath a parachute, the measurement scheme adopted used narrow fields of view (5 deg full width at half maximum response). It is found that at pressures greater than 1.3 atm, the variation of upward and downward flux with depth is very smooth and slow in contrast to the situation at lower pressures. Detailed inspection of the low-pressure region indicates excellent correlation of the rate of flux decrease with the measurement of cloud layers by the cloud particle size spectrometer and the nephelometer experiments.

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