Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009dps....41.6305s&link_type=abstract
American Astronomical Society, DPS meeting #41, #63.05
Astronomy and Astrophysics
Astronomy
Scientific paper
We present temperature measurements from the Venus mesosphere around 110 km altitude. Data was acquired using the infrared heterodyne receivers THIS (Tuneable Heterodyne Infrared Spectrometer/University of Cologne, Germany) and HIPWAC (Heterodyne Instrument for Planetary Wind And Composition, NASA GSFC) at the McMath-Pierce solar telescope and the NASA Infrared Telescope Facility, respectively, to observe non-LTE CO2 emission features on Venus between 2007 and 2009. Kinetic temperatures from the sunlit region of the apparent disc of the planet were calculated from the width of the fully resolved non-LTE emission lines in the 10µm wavelength region. In general, we find higher temperatures as predicted by the VIRA reference atmosphere. In addition, rotational temperatures were calculated from the intensity distribution of several rotational lines of CO2. However, the retrieved values are not consistent with the kinetic temperatures and show a large scatter. This is attributed to fluctuations in the line intensities linked to variability in the atmosphere of Venus. In addition, we will present a preliminary comparison to temperatures from sub-mm CO observations carried out concurrently to our IR observations and probing a slightly different altitude region.
Clancy Trevor
Kostiuk Theodor,
Kroetz Peter
Livengood Tim
Sandor Bulcsu
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