Cassini CIRS update on stratospheric ices at Titan's winter pole |
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| Authors: | Robert E Samuelson Michael D Smith John C Pearl |
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| Institution: | a Department of Astronomy, University of Maryland, College Park, MD 20742, USA
b NASA/Goddard Space Flight Center, Code 693, Greenbelt, MD 20771, USA |
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| Abstract: | A strong, broad spectral emission feature at 85° N latitude centered at 221 cm−1 remains unidentified after candidate ices of H2O and pure crystalline CH3CH2CN are unambiguously ruled out. A much shallower weak emission feature starts at 160 cm−1 and blends into the strong feature at ∼190 cm−1. This feature is consistent with one formed by an HCN ice cloud composed of ?5 μm radius particles that resides in the lower stratosphere somewhere below an altitude of 160 km. Titan's stratospheric aerosol appears to have a spectral emission feature at about 148 cm−1. The aerosol abundance at 85° N is about a factor 2.2 greater than at 55° S. |
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| Keywords: | Titan Atmospheres composition Ices IR spectroscopy |
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