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==> Time for this proposal is to be transferred from ACOUSTEN.TITAN A
==> This proposal requests an upgrade from priority 3 for ACOUSTEN.TITAN A
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We propose to record the short-wavelength spectrum of Titan between
2 and 9 micron with CAM-CVF and between 2 and 12 micron with PHOT-S.
Some of these regions of very low flux (in particular the 4-5 mu region)
cannot be observed with SWS with sufficient S/N. These data will provide
information about the lower troposphere and the surface of Titan, in
particular in the windows around 2.5-3.2mu and 4-5mu, very difficult to
access from the ground. The 5-7mu region will provide data on a completely
unexplored region of the spectrum, where both the reflected sunlight and
the thermal emission contribute to the spectrum. PHT-S and CAM data are
highly complementary, as the PHT-S data extend up to 12 mu, whereas
the CAM data cover the 5-6 mu region. In addition, the CAM data will allow
for a better correction of Saturn's straylight contamination. Observations
will be performed at Titan's maximum eastern elongation, where more flux is
expected than elsewhere on the orbit. The PHT-S observation of Titan was
already planned in the Central Program proposal of Coustenis et al
(ACOUSTEN.TITAN A), with Priority 3. We propose to transfer the time
allocated to ACOUSTEN.TITAN A (7200 s) and to this proposal with Priority 1.