Wuppertal 2015 – wissenschaftliches Programm
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EP: Fachverband Extraterrestrische Physik
EP 10: Planeten 1
EP 10.7: Vortrag
Donnerstag, 12. März 2015, 18:30–18:45, G.10.02 (HS 9)
Long-term Variation in Temperature and Dynamic in Venus Upper Atmosphere from ground-based Infrared Heterodyne Spectroscopy — •Pia Krause1,2, Manuela Sornig1,2, Carolin Wischnewski1,2, Moritz Wiegand1, Tobias Stangier3, Maren Herrmann2, Guido Sonnabend3, Theodor Kostiuk4, and Tim Livengood4,5 — 1I. Physical Institute, University of Cologne, Germany — 2Rhenish Institute for Environmental Research at the University of Cologne, Department for Planetary Science, Germany — 3RPG Radiometer Physics GmbH, Meckenheim, Germany, — 4NASA Goddard Space Flight Center, Maryland, USA — 5GRESST/UMD
We report on the long-term behavior of day-side temperature and dynamic in the Venusian upper mesosphere/lower thermosphere (110km), deduced from CO2 emission lines. Ground-based heterodyne infrared spectra have been acquired between 1990 and 2013. Temperature and Doppler wind values are retrieved from detection of fully resolved non-LTE emission lines of CO2 at 10 mue*m. Especially the dynamics of the transition zone between the region dominated by sub-solar to anti-solar flow above 120 km and the superrotation dominated region below 90 km is not yet fully understood. Temperatures in the same region are not very well constrained either. Measurements are essential to gain a global understanding of the atmosphere and to validate global circulation models. Several observing runs over the last decades were dedicated to collect information from Venus' upper atmosphere. These observing runs delivered a comprehensive data set to investigate long term temporal trends and shall be presented at the conference.