Morphology of the Venus clouds from the imaging by Venus Monitoring Camera onboard Venus Express

Details Morphology of the Venus clouds from the imaging by Venus Monitoring Camera onboard Venus Express Morphology of the Venus clouds from the imaging by Venus Monitoring Camera onboard Venus Express

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008epsc.conf..225t&link_type=abstract

European Planetary Science Congress 2008, Proceedings of the conference held 21-25 September, 2008 in Münster, Germany. Online a

Physics

Scientific paper

For more than 2 years Venus Monitoring Camera onboard ESA's Venus Express collects images of Venus from global views with resolution of ~50 km to close-up snapshots resolving features of about few hundreds meters. The UV filter is centered at a characteristic wavelength of the unknown UV absorber (365 nm) and allows one to study morphology of the cloud tops that bears the information about dynamical process and distribution of the UV absorber. Low latitudes (< 40 deg) are dominated by relatively dark clouds that have mottled and fragmented appearance clearly indicating convective activity in the sub-solar region. At ~50 degrees latitude this pattern gives way to streaky clouds suggesting that horizontal flow prevails here. Poleward from ~60 degrees the planet is covered by almost featureless bright polar hood sometimes crossed by dark thin (~300 km) spiral or circular structures. This global cloud pattern changes on time scales of few days resulting in so called "brightening events" when the bright haze can extend far into low latitudes. Cloud pattern shows remarkable diurnal variability. Afternoon sector of the planet has strongly developed traces of turbulence in contrast to the atmosphere in the morning. Also the bright hood extends further to low latitudes in the morning than in the evening. We will present latitudinal, diurnal, and temporal variations based on two years of VMC observations. Imaging of streaky clouds in the middle and high latitudes provides a tool to study the wind pattern. We will also present preliminary results on the cloud streaks orientation derived from the VMC images.

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