Other
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufm.p22a..04c&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #P22A-04
Other
0343 Planetary Atmospheres (5210, 5405, 5704), 5408 Aurorae And Airglow, 5464 Remote Sensing, 5494 Instruments And Techniques, 6295 Venus
Scientific paper
The VIRTIS instrument onboard Venus Express has been using its Mapping channel successfully since the Venus orbit insertion on 11th April 2005. The hyper-spectral images obtained in the near-Infrared and Visible cover a wide spectral range (5um-250nm) with good sampling capabilities, which make them highly useful for the study of morphology, dynamics and composition of the atmosphere and the surface. Single observations performed by VIRTIS typically cover only a fraction of the Venus' disk and thus they provide instantaneous information of local features. We are now investigating a new approach to study the global morphology of Venus' atmosphere by linking the current 3-dimensional VIRTIS measurements (2 spatial + 1 spectral) with their evolution in time, thanks to the good coverage of the instrument, mapping same regions at different times and with different conditions (season, local solar time, etc). We present high quality global distribution maps of radiance over the whole planet, with results showing the different morphology of various layers of the atmosphere, e.g. Oxygen Nightglow emission at 1.27um in the upper mesosphere and deep atmosphere clouds observed at 1.74um. In addition, we can compare different emissions probing the same layer, as in the case of the radiance at 1.74um/2.3um and the Thermal Brightnesses at 3.8um/5um. All these global distribution maps show interesting dependences with latitude and local time (or longitude) giving useful information for the study of the global morphology of Venus' atmosphere. Other products derived by the new system such as time series, coverage maps, radiance variation plots and radiance stability maps can also lead to a more detailed analysis and a better understanding of the global dynamics and morphology of the atmosphere.
Cardesín Moinelo Alejandro
Drossart Pierre
Migliorini Alessandra
Piccioni Giuseppe
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