Fractal Particles: Titan's Thermal Structure and IR Opacity

Details Fractal Particles: Titan's Thermal Structure and IR Opacity Fractal Particles: Titan's Thermal Structure and IR Opacity

Sep 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998dps....30.4102m&link_type=abstract

American Astronomical Society, DPS meeting #30, #41.02; Bulletin of the American Astronomical Society, Vol. 30, p.1091

Astronomy and Astrophysics

Astronomy

Scientific paper

Titan's haze particles are the principle opacity at solar wavelengths. Most past work in modeling these particles has assumed spherical particles. However, observational evidence strongly favors fractal shapes for the haze particles. We consider the implications of fractal particles for the thermal structure and near infrared opacity of Titan's atmosphere. We find that assuming fractal particles with the optical properties based on laboratory tholin material and with a production rate that allows for a match to the geometric albedo results in warmer troposphere and surface temperatures compared to spherical particles. In the near infrared (1-3 microns) the predicted opacity of the fractal particles is up to a factor of two less than for spherical particles. This has implications for the ability of Cassini to image Titan's surface at 1 micron.

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