Müller, N. and Helbert, J. and Marinangeli, L. and Piccioni, G. and Drossart, P. and Hashimoto, G.L. and VIRTIS-VEX-Team, (2007) Preliminary Interpretation of Surface Observations with VIRTIS on Venus Express. In: Geophysical Research Abstracts, 9, 08803. EGU General Assembly, 2007-04-15 - 2007-04-20, Vienna, Austria.
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Through narrow spectral regions at 1.02, 1.10 and 1.18 μm thermal emission from the surface of Venus escapes into space, carrying with it information about its source. Since orbit insertion in April 2006 VIRTIS on Venus Express is mapping this radiation using nightside observation of Venus. While the atmospheric windows show little CO2 absorption, the radiance from the surface is still affected by scattering in the clouds. This effect varies based on the optical thickness of the clouds. We present a data processing pipeline for the VIRTIS-M data which corrects for various atmospheric effects, incl. limb darkening, scattered sunlight, etc and provides a ’declouding’ algorithm that retrieves surface information from VIRTIS multispectral infrared images. Using this pipeline we have mapped the southern hemisphere of Venus and will present a preliminary interpretation of the results. This interpretation includes correlation with Magellan radar altimetry and microwave emissivity as well as a search for systematic variation of surface emissivity with morphological features such as tesserae, coronae or plains. An upper limit of transient temperature anomalies observed in the areas covered by VIRTIS during several consecutive orbits will be given.
|Document Type:||Conference or Workshop Item (Speech)|
|Title:||Preliminary Interpretation of Surface Observations with VIRTIS on Venus Express|
|Date:||20 April 2007|
|Journal or Publication Title:||Geophysical Research Abstracts|
|Keywords:||Venus, surface, Venus Express, VIRTIS|
|Event Title:||EGU General Assembly|
|Event Location:||Vienna, Austria|
|Event Type:||international Conference|
|Event Dates:||2007-04-15 - 2007-04-20|
|Organizer:||European Geosciences Union|
|HGF - Research field:||Aeronautics, Space and Transport (old)|
|HGF - Program:||Space (old)|
|HGF - Program Themes:||W EW - Erforschung des Weltraums|
|DLR - Research area:||Space|
|DLR - Program:||W EW - Erforschung des Weltraums|
|DLR - Research theme (Project):||W - Vorhaben Venus Express (old)|
|Institutes and Institutions:||Institute of Planetary Research > Planetary Physics|
|Deposited By:||Stefanie Musiol|
|Deposited On:||10 May 2007|
|Last Modified:||27 Apr 2009 13:42|
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