  We report vertical thermal structure and wind velocities in the Venusian
mesosphere retrieved from carbon monoxide (12CO J=2-1 and 13CO J=2-1) spectral
line observations obtained with the Heinrich Hertz Submillimeter Telescope
(HHSMT). We observed the mesosphere of Venus from two days after the second
Messenger flyby of Venus (on June 5 2007 at 23:10 UTC) during five days.
Day-to-day and day-to-night temperature variations and short-term fluctuations
of the mesospheric zonal flow were evident in our data. The extensive layer of
warm air detected recently by SPICAV at 90 - to 100 km altitude is also
detected in the temperature profiles reported here. These data were part of a
coordinated ground-based Venus observational campaign in support of the ESA
Venus Express mission. Furthermore, this study attempts to cross-calibrate
space- and ground-based observations, to constrain radiative transfer and
retrieval algorithms for planetary atmospheres, and to contribute to a more
thorough understanding of the global patterns of circulation of the Venusian
atmosphere.
