Reassessment of net radiation measurements in the atmosphere of Venus

Physics – Optics

Scientific paper

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Atmospheric Optics, Opacity, Pioneer Venus Spacecraft, Radiant Flux Density, Radiation Measurement, Venus Atmosphere, Atmospheric Temperature, Gas Flow, Radiative Transfer, Reynolds Number, Venus Clouds

Scientific paper

An analysis was performed of the possible error mechanisms which degraded the IR net flux measurements made by the three small atmospheric probes dispatched from the Pioneer Venus spacecraft. The larger errors began below 30 km, and caused the data to be inconsistent with previous estimates of the atmospheric opacity. Evaluations were made of the possible radiation field perturbations behind each probe, cloud particle deposition on the sensor windows, and thermal disturbances within the sensors because of gas flow through the window retainers. The gas flow through the retainers was identified as the most likely error source, and was demonstrated in laboratory tests. A strong Reynolds number dependence was also found. Radiative transfer calculations were performed to account for the errors, using the constraints defined by the tests. Upper and lower bounds were calculated for the true net flux for both day and night conditions.

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