Physics – Optics
Scientific paper
Jul 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3117s02g&link_type=abstract
Geophysical Research Letters, Volume 31, Issue 17, CiteID L17S02
Physics
Optics
4
Planetology: Solid Surface Planets: Atmospheres-Evolution, Planetology: Solid Surface Planets: Composition, Planetology: Solar System Objects: Saturnian Satellites
Scientific paper
We observed Titan in 1996-2004 with high-resolution 2 μm speckle and adaptive optics imaging at the W. M. Keck Observatory. By observing in a 2 μm broadband filter we obtain images that have contributions from both Titan's surface and atmosphere. We have modeled Titan's atmosphere using a plane-parallel radiative transfer code that has been corrected to agree with 3-D Monte Carlo predictions. We find that Titan's surface albedo ranges from <=0.02 in the darkest equatorial region of the trailing hemisphere to $\simeq$0.1 in the brightest areas of the leading hemisphere. Over the past quarter of a Saturnian year haze optical depth in Titan's Southern hemisphere has decreased substantially from a value of 0.48 in 1996 down to 0.18 in 2004, while the northern haze has been increasing over the past few years. As a result of these changes, in 2004 the North/South haze asymmetry at K' band has disappeared.
de Pater Imke
Gibbard Seran G.
Macintosh Bruce Alan
Max Claire Ellen
McKay Chris P.
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