Temperature Retrievals in the Venus Mesosphere by Venus Express/VIRTIS

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Scientific paper

The ESA Venus Express spacecraft successfully went into orbit about Venus on April 11th 2006, achieving a highly eccentric polar orbit with a period of 24 hours. One of the instruments on board, VIRTIS (UV-Visible-InfraRed mapping spectrometer) observes both reflected sunlight and thermal emission in the range 0.25 - 5 microns. On the nightside, the spectral region from 4 to 5 microns is sensitive to thermal emission from the Venus mesosphere and the 4.3 and 4.8 micron bands of CO2 may be used for temperature sounding from 70 - 90 km. On the dayside, a significant fraction of the radiation detected is sunlight reflected from the cloud layers, which needs to be corrected for before the spectra can be used for temperature retrievals.
We will present preliminary conclusions on the retrievability of temperature from these data and also initial results on the temperature structure in the Venus mesosphere during Venus Express' mission.

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