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The organic haze produced from complex CH4/N2 chemistry in the atmosphere ofTitan plays an important role in processes that occur in the atmosphere and onits surface. The haze particles act as condensation nuclei and are thereforeinvolved in Titan's methane hydrological cycle. They also may behave likesediment on Titan's surface and participate in both fluvial and aeolianprocesses. Models that seek to understand these processes require informationabout the physical properties of the particles including their size anddensity. Although measurements obtained by Cassini-Huygens have placedconstraints on the size of the haze particles, their densities remain unknown.We have conducted a series of Titan atmosphere simulation experiments andmeasured the size, number density, and particle density of Titan aerosolanalogues, or tholins, for CH4 concentrations from 0.01% to 10% using twodifferent energy sources, spark discharge and UV. We find that the densitiescurrently in use by many Titan models are higher than the measured densities ofour tholins.

In Situ Measurements of the Size and Density of Titan Aerosol Analogues