Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufm.p53a1444s&link_type=abstract
American Geophysical Union, Fall Meeting 2004, abstract #P53A-1444
Astronomy and Astrophysics
Astronomy
6280 Saturnian Satellites, 3360 Remote Sensing, 3319 General Circulation, 0300 Atmospheric Composition And Structure
Scientific paper
The Goddard Space Flight Center Heterodyne Instrument for Planetary Wind And Composition, HIPWAC, was used at the National Astronomical Observatory of Japan Subaru Telescope on Mauna Kea, Hawaii to measure Ethane emission features near 12 μ m. HIPWAC spectral resolving power of >106 and the 0.36 arcsec diffraction limited FOV on Titan with the 8.2 m Subaru telescope enabled recording of true emission line profiles on the East and West hemispheres of Titan. The direction and magnitude of global stratospheric wind on Titan was determined by analyzing differences in the line frequencies (Doppler shifts). The line profiles were fit to retrieve ethane abundances and constraints on the thermal structure near 0.5 mbar pressures. The near equatorial FOV positions overlapped the Huygens probe entry latitude. Analyses retrieved a prograde wind of 170±90 m/s. Ethane abundance was 0.7±0.3 x 10-5. The indication of temperature profile variations between the two hemispheres of Titan will be presented and comparisons to 1993-96 InfraRed Heterodyne Spectrometer, IRHS at NASA's InfraRed Telescope Facility will be made. Possible explanations for the temperature differences will be discussed. An outlook for expected results from measurements on Subaru during the descent of Huygens into Titan's atmosphere on January 14, 2005 UT will be given. Work was supported by the NASA Planetary Astronomy Program.
Annen John
Buhl David
Fast Kelly Elizabeth
Hewagama Tilak
Kostiuk Theodor,
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