Other
Scientific paper
Sep 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008dps....40.6204k&link_type=abstract
American Astronomical Society, DPS meeting #40, #62.04; Bulletin of the American Astronomical Society, Vol. 40, p.512
Other
Scientific paper
The capability of near infrared nightside thermal emission measurements by the Visible and Infrared Thermal Imaging Spectrometer (VIRTIS) on Venus Express (VEX) was used to extract surface properties in the northern hemisphere of Venus. The study includes VIRTIS topographic footprint variations from - 2000 m to 6000 m in height. Preliminary radiative transfer calculation techniques were applied to simulate Venus nightside radiation with respect to the cloud opacity and surface elevation. The results were compared to the VIRTIS measurements.
Below 1.5 µm conservative scattering is the dominating cloud feature. Therefore, radiance ratios in the 1.0-1.35 µm spectral windows can be used to eliminate cloud interferences. It is shown that the radiance ratios of the 1.10, 1.18, 1.28, and 1.31 µm windows with respect to the radiance in the 1.02 µm window are independent of the cloud influence.
Simulations for constant cloud opacity at 1.02, 1.10 and 1.18 µm show a clear dependence of the transmitted nightside radiation on topography. The radiance decreases with increasing elevation, since highlands are cooler and emit less thermal radiation than areas at lower altimetry. The measured and simulated window radiance ratios are in a good agreement with respect to the surface elevation.
The correlation between the ratios of the surface window radiances and elevation was used to retrieve the surface topography and temperatures near Beta Regio. VIRTIS and Magellan topographies are largely in agreement with each other but differences are obtained in certain small areas. They will be of special interest for the future separation of surface temperature, emissivity and deep atmosphere dynamic phenomena.
Arnold Gabriele
Dohler W.
Drossart Pierre
Haus Rainer
Kappel David
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