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FIRST OBSERVATION IN THE SOUTH OF TITAN'S FAR-INFRARED 220 cm(-1) CLOUD
Authors
RK Achterberg
CM Anderson
+16Â more
G Bampasidis
GL Bjoraker
SB Calcutt
RC Carlson
V Cottini
A Coustenis
R de Kok
FM Flasar
BE Hesman
DE Jennings
VG Kunde
CA Nixon
PN Romani
RE Samuelson
NA Teanby
S Vinatier
Publication date
1 January 2012
Publisher
Doi
Cite
Abstract
An emission feature at 220 cm-1 which has been attributed to a cloud of condensed material in Titan's winter stratosphere has been seen for the first time in the south. This feature had previously been found only at high northern latitudes during northern winter and spring. The material emitting at 220 cm-1, as yet unidentified, may be volatiles associated with nitrile gases that accumulate in the absence of ultraviolet sunlight. Not detected as recently as 2012 February, the 220 cm-1 feature clearly appeared at the south pole in Cassini spectra recorded on 2012 July 24, indicating a rapid onset of the emission. This is the first indication of the winter buildup of condensation in the southern stratosphere that has been expected as the south pole moves deeper into shadow. In the north the 220 cm-1 feature continued to decrease in intensity with a half-life of 3 years. © 2012. The American Astronomical Society. All rights reserved
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