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

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

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufm.p33a1430t&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #P33A-1430

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0300 Atmospheric Composition And Structure, 0343 Planetary Atmospheres (5210, 5405, 5704), 0350 Pressure, Density, And Temperature, 6295 Venus, 6900 Radio Science

Scientific paper

The Venus Express Radio Science Experiment VeRa is sounding the Venus neutral atmosphere and ionosphere using the spacecraft radio subsystem in the oneway radio link mode at X-band (8.4 GHz) and S- band (2.3 GHz). An Ultrastable Oscillator (USO) provides a high quality onboard frequency reference source for the derivation of electron density profiles in the ionosphere and profiles of pressure, temperature and neutral number density of the neutral atmosphere. Radial profiles of neutral number density derived from the occultations cover the altitude range 40 to 90 km, which are converted to vertical profiles of temperature and pressure. The polar orbit of Venus Express provides the opportunity to study the atmosphere at all planetocentric latitudes under varying illumination conditions. Five occultation seasons could be covered so far during the Venus Express mission resulting in a data set of more than 150 profiles of the neutral atmosphere. The thermal structure is investigated with regard to the latitudinal and temporal variability. A distinct cold collar region could be observed on both hemispheres. The tropopause altitude increases in this latitude region while the tropopause temperature shows a strong decrease. Profiles of static stability are found to be latitude-dependent and nearly adiabatic in the middle cloud region.

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