Author
Karkoschka, ErichAffiliation
Lunar and Planetary Laboratory, University of ArizonaIssue Date
2022-11
Metadata
Show full item recordPublisher
Elsevier BVCitation
Karkoschka, E. (2022). Titan’s haze at opposite seasons from HST-STIS spectroscopy. Icarus, 387.Journal
IcarusRights
© 2022 Elsevier Inc. All rights reserved.Collection Information
This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.Abstract
We present an analysis of three new image cubes of Titan by the Space Telescope Imaging Spectrograph taken in 2017, 2018, and 2019, half a Titan year after previously analyzed image cubes. Both data sets probe periods when Titan's seasonal north-south-asymmetry switched. The new observations show that the new reversal came exactly half a Titan year after the previous opposite reversal. On the other hand, the phase lag of the reversals with respect to Titan's equinoxes was different indicating that the seasonal variation is close to harmonic and does not follow variations due to Saturn's orbital eccentricity. The reversal had two components, a major one at altitudes below 80 km reversing two years after a minor one above 150 km. The observations further revealed small temporary deviations of <10% of the seasonal amplitude. The new observations provide an improved seasonal model of Titan that gives accurate constraints for future global circulation models.Note
24 month embargo; available online: 19 July 2022ISSN
0019-1035Version
Final accepted manuscriptSponsors
Space Telescope Science Instituteae974a485f413a2113503eed53cd6c53
10.1016/j.icarus.2022.115188