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We observed a stellar occultation by Titan on 2003 November 14 from La PalmaObservatory using ULTRACAM with three Sloan filters: u', g', and i' (358, 487,and 758 nm, respectively). The occultation probed latitudes 2 degrees S and 1degrees N during immersion and emersion, respectively. A prominent centralflash was present in only the i' filter, indicating wavelength-dependentatmospheric extinction. We inverted the light curves to obtain six lower-limittemperature profiles between 335 and 485 km (0.04 and 0.003 mb) altitude. Thei' profiles agreed with the temperature measured by the Huygens AtmosphericStructure Instrument [Fulchignoni, M. et al., 2005. Nature 438, 785-791] above415 km (0.01 mb). The profiles obtained from different wavelength filterssystematically diverge as altitude decreases, which implies significantextinction in the light curves. Applying an extinction model [Elliot, J.L.,Young, L.A., 1992. Astron. J. 103, 991-1015] gave the altitudes of line ofsight optical depth equal to unity: 396 +/- 7 km and 401 +/- 20 km (u'immersion and emersion); 354 +/- 7 km and 387 +/- 7 km (g' immersion andemersion); and 336 +/- 5 km and 318 +/- 4 km (i' immersion and emersion).Further analysis showed that the optical depth follows a power law inwavelength with index 1.3 +/- 0.2. We present a new method for determiningtemperature from scintillation spikes in the occulting body's atmosphere.Temperatures derived with this method are equal to or warmer than thosemeasured by the Huygens Atmospheric Structure Instrument. Using the highlystructured, three-peaked central flash, we confirmed the shape of Titan'smiddle atmosphere using a model originally derived for a previous Titanoccultation [Hubbard, W.B. et al., 1993. Astron. Astrophys. 269, 541-563].

The 2003 Nov 14 occultation by Titan of TYC 1343-1865-1. II. Analysis of light curves