The Synthetic Spectrum of Venus in the 8-micron Region

Details The Synthetic Spectrum of Venus in the 8-micron Region The Synthetic Spectrum of Venus in the 8-micron Region

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010dps....42.1003e&link_type=abstract

American Astronomical Society, DPS meeting #42, #10.03; Bulletin of the American Astronomical Society, Vol. 42, p.994

Astronomy and Astrophysics

Astronomy

Scientific paper

The thermal emission of Venus in the 1220-1380 cm-1 range, observable from the ground, probes the upper atmosphere, above the H2SO4 clouds. Depending upon the altitude of the upper clouds, the brighness temperature of the continuum, as measured by the Venera probes, is expected to range between about 220 and 240 K. A calculation of the synthetic spectrum of Venus at high resolution (R > 50000) shows that transitions of CO2, HDO and SO2 are expected to be detectable. Mapping the disk of Venus from the ground in the 8-micron region, both on the night side and on the day side, at the time of quadrature, should give information upon the variations of SO2 as a function of latitude which are presently a matter of debate. In addition, day-night variations of H2O could also be studied through the use of HDO transitions, and a global estimate of the D/H ratio above the clouds could be inferred.
Such observations could be performed using the TEXES high-resolution imaging spectrometer at IRTF and, in the future, with the EXES instrument aboard the SOFIA spacecraft. This program will fully complement the VIRTIS/VEx observations which probe HDO and SO2 in the lower atmosphere of Venus in the 2-4 micron region.

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