The Structure of the Venus Neutral Atmosphere from the Radio Science Experiment VeRa on Venus Express

Details The Structure of the Venus Neutral Atmosphere from the Radio Science Experiment VeRa on Venus Express The Structure of the Venus Neutral Atmosphere from the Radio Science Experiment VeRa on Venus Express

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008epsc.conf...44t&link_type=abstract

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

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The Venus Express Radio Science Experiment VeRa uses one-way radio signals at X-band (8.4 GHz) and S-band (2.3 GHz) for the sounding of the Venus neutral atmosphere and ionosphere. Three occultation seasons could be covered during the nominal mission of Venus Express resulting in a data set of about 118 profiles of the neutral atmosphere. Another three occultation seasons are planned during the extended mission. The polar orbit of Venus Express provides the opportunity to study the atmosphere at a large range of planetocentric latitudes under varying illumination conditions. Radial profiles of neutral number density derived from the occultations cover the altitude range 40-90 km, which are converted to vertical profiles of temperature and pressure. Profiles of static stability are found to be latitude-dependent and nearly adiabatic in the middle cloud region. Below the clouds the stability decreases at high latitudes. A large equator-to-pole temperature contrast of approximately 30 K is found at the 1-bar level. A distinct cold collar region could be observed on both hemispheres. At the latitudes of the cold collars, the tropopause altitude increases relative to higher and lower latitudes, while the temperature drops roughly 60 K. The observations indicate the existence of a wave number 2 structure polewards of ±75° latitude at altitudes of about 60 km.

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