Universität zu Köln

Kostiuk, Theodor, Hewagama, Tilak, Fast, Kelly E., Livengood, Timothy A., Armen, John, Buhl, David, Sonnabend, Guido, Schmulling, Frank, Delgado, Juan D. and Achterberg, Richard ORCID: 0000-0002-7643-7626 (2010). High spectral resolution infrared studies of Titan Winds, temperature, and composition. Planet Space Sci., 58 (13). S. 1715 - 1724. OXFORD: PERGAMON-ELSEVIER SCIENCE LTD. ISSN 0032-0633

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Abstract

The Cassini Huygens mission provides a unique opportunity to combine ground-based and spacecraft investigations to increase our understanding of chemical and dynamical processes in Titan s atmosphere Spectroscopic measurements from both vantage points enable retrieving global wind structure temperature structure and atmospheric composition An updated analysis of Titan data obtained with the NASA Goddard Space Flight Center s Infrared Heterodyne Spectrometer (IRHS) and Heterodyne Instrument for Planetary Wind and Composition (HIPWAC) prior to and during the Cassini Huygens mission is compared to retrievals from measurements with the Cassini Composite Infrared Spectrometer (CIRS) IRHS/HIPWAC results include the first direct stratospheric wind measurements on Titan constraints on stratospheric temperature and the study of atmospheric molecular composition These results are compared to CIRS retrievals of wind and temperature profile from thermal mapping data and ethane abundance at 10-15 degrees South latitude near the equatorial region IRHS/HIPWAC wind results are combined with other direct techniques stellar occultation measurements and CIRS results to explore seasonal variability over nearly one Titan year and to provide an empirical altitude profile of stratospheric winds varying from similar to 50 to 210 m/s prograde The advantage of fully resolved line spectra in species abundance measurements is illustrated by comparing the possible effect on retrieved ethane abundance by blended spectral features of other molecular constituents e g acetylene (C2H2) ethylene (C2H4) allene (C3H4) and propane (C3H8) which overlap the nu(9) band of ethane and are not resolved at lower spectral resolution IR heterodyne spectral resolution can discriminate weak spectral features that overlap the nu(9) band of ethane enabling ethane lines alone to be used to retrieve abundance Titan s stratospheric mean ethane mole fraction (8 6+/-3 ppmv) retrieved from IRHS/HIPWAC emission line profiles (resolving power lambda/Delta lambda similar to 10(6)) is compared to past values obtained from lower resolution spectra and from CIRS measurements (resolving power lambda/Delta lambda similar to 2 x 10(3)) and more compatible recent analysis Results illustrate how high spectral resolution ground-based studies complement the spectral and spatial coverage and resolution of moderate spectral resolution space-borne spectrometers Published by Elsevier Ltd

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Kostiuk, Theodor UNSPECIFIED UNSPECIFIED UNSPECIFIED Hewagama, Tilak UNSPECIFIED UNSPECIFIED UNSPECIFIED Fast, Kelly E. UNSPECIFIED UNSPECIFIED UNSPECIFIED Livengood, Timothy A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Armen, John UNSPECIFIED UNSPECIFIED UNSPECIFIED Buhl, David UNSPECIFIED UNSPECIFIED UNSPECIFIED Sonnabend, Guido UNSPECIFIED UNSPECIFIED UNSPECIFIED Schmulling, Frank UNSPECIFIED UNSPECIFIED UNSPECIFIED Delgado, Juan D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Achterberg, Richard UNSPECIFIED orcid.org/0000-0002-7643-7626 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-493939
DOI:	10.1016/j.pss.2010.08.004
Journal or Publication Title:	Planet Space Sci.
Volume:	58
Number:	13
Page Range:	S. 1715 - 1724
Date:	2010
Publisher:	PERGAMON-ELSEVIER SCIENCE LTD
Place of Publication:	OXFORD
ISSN:	0032-0633
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language ATMOSPHERIC TEMPERATURES; LATITUDINAL VARIATIONS; ZONAL WINDS; STRATOSPHERE; ETHANE; OCCULTATION; ABUNDANCE; PLANETS Multiple languages Astronomy & Astrophysics Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/49393