Structure Of The Core Of The Southern Vortex On Venus: VMC And VIRTIS Observations From Venus Express

Details Structure Of The Core Of The Southern Vortex On Venus: VMC And VIRTIS Observations From Venus Express Structure Of The Core Of The Southern Vortex On Venus: VMC And VIRTIS Observations From Venus Express

Oct 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007dps....39.5805l&link_type=abstract

American Astronomical Society, DPS meeting #39, #58.05; Bulletin of the American Astronomical Society, Vol. 39, p.533

Astronomy and Astrophysics

Astronomy

Scientific paper

In April 2007, a special observational campaign was conducted from Venus Express using the high data rate transmissions available through a NASA DSN to obtain a movie of the South pole region of Venus. Previously, the VIRTIS observations showed a remarkable view of the hemispheric vortex centered roughly over the South pole with a well defined "S” shape structure within the core region. Concurrent ultraviolet (cloud top) and near infrared observations ( 50 km level) available from Venus Express enable us to examine the vertical structure in greater detail than possible before.
Tracking of cloud features in the ultraviolet and near infrared data have been used to determine the horizontal flow at two levels. These results suggest that the horizontal (still dominantly zonal) flow in polar regions does not have large meridional shear. The morphology of the features seen in ultraviolet and near infrared data suggests that the core region does not rotate as a rigid cylinder, but exhibits twisting in the vertical. These observations provide us an insight into the structure of the global vortex circulation in the atmosphere of Venus, first detected in 1974 from Mariner 10 images.
This research was supported by NASA Grant NNG06GC68G.

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