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21-0 niter (2.111 to 2.137 μm) show primarily tropospheric cloud activity. As a result of high methane, opacity images in the Bry filter [2.154 to 2.183 μm (21)] show only the high haze layers approximately above the tropopause. The clouds do not appear in the Brγ filter images, thus allowing us to restrict their altitude range to the troposphere. At these wavelengths the scattering due to haze particles is much weaker than at shorter visible wavelengths, giving the clearest possible view of atmospheric and surface features on Titan.
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27144494014
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note
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We acquired images with high enough contrast and resolution to detect the mid-latitude clouds on the Keck telescope on universal time coordinated (UTC) dates: 17 September 2003, 10 to 12 October 2003, 9 November 2003, 11 to 14 November 2003, 18 November 2003, 29 November 2003, 10 December 2003, 15 December 2003, 17 to 18 December 2003, 24 to 27 December 2003, 9 to 10 January 2004, 2 September 2004, 28 September 2004, 2 to 3 October 2004, 7 to 8 October 2004, 23 October 2004, 28 October 2004, 2 to 3 November 2004, 27 November 2004, 19 to 20 December 2004, 14 January 2005, 20 January 2005, 14 to 15 February 2005, 25 February 2005, and 27 to 28 February 2005.
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27144500226
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note
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We acquired images with high enough contrast and resolution to detect the mid-latitude clouds on the Gemini telescope on UTC dates: 13 November 2003, 15 November 2003, 17 to 18 November 2003, 4 to 9 April 2004, 30 April 2004, 4 to 7 May 2004, 23 to 24 October 2004, 1 to 2 November 2004, 4 to 5 November 2004, 21 December 2004, 24 to 25 December 2004, 27 December 2004, 16 January 2005, 23 to 25 January 2005, 28 January 2005, 8 to 10 February 2005, 12 February 2005, 14 to 16 February 2005, 19 to 22 February 2005, 1 to 2 March 2005, 4 to 5 March 2005, 9 March 2005, and 24 March 2005.
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data not shown
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Roe, H.G.1
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27144477409
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note
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H.G.R. is supported by an NSF Astronomy and Astrophysics Postdoctoral Fellowship (NSF AST-0401559). E.L.S. is supported by an NSF Graduate Research Fellowship. Additional support was provided by an NSF grant to M.E.B. (NSF AST-0307929). The W. M. Keck Observatory is operated as a scientific partnership among the California institute of Technology, the University of California, and NASA, and made possible by financial support of the W. M. Keck Foundation. The Gemini Observatory is operated by the Association of Universities for Research in Astronomy, under a cooperative agreement with the NSF on behalf of the Gemini partnership: the NSF, the Particle Physics and Astronomy Research Council (UK), the National Research Council (Canada), Comisión Nacional de Investigación Científica y Tecnológica (CONICYT) (Chile), the Australian Research Council (Australia), Conselho Nacional de Desenvolvimento Cientifíco e Tecnológico (CNPq) (Brazil), and Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) (Argentina).
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