Possible Ground Fog Detection From SLI Imagery of Titan

By Keith Cowing
Press Release
March 19, 2016
Filed under
Possible Ground Fog Detection From SLI Imagery of Titan
Imagery of Titan's Fog

Titan, with its thick, nitrogen-dominated atmosphere, has been seen from satellite and terrestrial observations to harbour methane clouds.

To investigate whether atmospheric features such as clouds could also be visible from the surface of Titan, data taken with the Side Looking Imager (SLI) on-board the Huygens probe after landing have been analysed to identify any potential atmospheric features. In total, 82 SLI images were calibrated, processed and examined for features.

The calibrated images show a smooth vertical radiance gradient across the images, with no other discernible features. After mean-frame subtraction, six images contained an extended, horizontal feature that had a radiance value that lay outside the 95% confidence limit of the predicted radiance when compared to regions higher and lower in the images.

The change in optical depth of these features were found to be between 0.005 and 0.014. It is considered that these features most likely originate from the presence of a fog bank close to the horizon that rises and falls during the period of observation.

Christina L. Smith, Brittney A. Cooper, John E. Moores
(Submitted on 14 Mar 2016)

Comments: Icarus, Available online 9 February 2016, ISSN 0019-1035
Subjects: Earth and Planetary Astrophysics (astro-ph.EP)
DOI: 10.1016/j.icarus.2016.02.002
Cite as: arXiv:1603.04413 [astro-ph.EP] (or arXiv:1603.04413v1 [astro-ph.EP] for this version)
Submission history
From: Christina Smith
[v1] Mon, 14 Mar 2016 19:45:39 GMT (825kb,D)

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