0.0 0.2 0.4 0,6 0.8 1.0 CONTRIBUTION FUNCTION

80 100 120 140 160 TEMPERATURE (K)

Figure 7.47. CIRS weighting functions for both limb-viewing and nadir-viewing at Saturn (from Calcutt et al., 1992). Courtesy of the British Interplanetary Society.

CIRS is a significant improvement on Voyager IRIS, with up to 10 x higher spectral resolution and vastly increased sensitivity, especially in the mid-infrared owing to its cooled HgCdTe detectors. In addition, the FOV of the mid-IR section is very small (0.273 x 0.273 mrad) allowing limb-viewing at these wavelengths for both Titan and Saturn. The transmission weighting functions for Saturn limb observations at various wavelengths are shown in Figure 7.47. The main atmospheric science objectives of CIRS are: (1) to map the global temperature structure within the atmospheres of these worlds; (2) to map the global composition of various known gases; (3) to map global information on hazes and clouds; (4) to collect information on energetic processes within these atmospheres; and (5) to search for new molecular species. As has been reported in Chapters 4 and 5, these goals have been handsomely achieved.

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