Optical properties of Titan's aerosol analogues (in the 200 nm - 2.5 µm range)

Details Optical properties of Titan's aerosol analogues (in the 200 nm - 2.5 µm range) Optical properties of Titan's aerosol analogues (in the 200 nm - 2.5 µm range)

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja....12426c&link_type=abstract

EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #12426

Computer Science

Scientific paper

In the upper atmosphere of Titan its main constituents, CH4 and N2 are photolyzed and radiolyzed by solar photons and magnetospheric electrons. The primary products of these chemical interactions evolve to heavier organic compounds which are likely to associate to form the particles of the haze layers that hide Titan's surface. Different theories and models have tried to explain the characteristics and properties of the haze material, but only with limited success. Among the parameters involved in these models, the complex refractive index of Titan's aerosols is one of the most critical due to the influence that the chemical composition and structural organization of the solid have on n and k values. We present a new set of values for n and k directly calculated from the transmission and reflectance curves exhibited by a laboratory analogue of Titan's aerosols in the 200 to 2500 nm range, covering Titan's methane windows. Our experimental protocol avoids the over irradiation of the aerosol analogues and the contamination with atmospheric oxygen. Structural and porosity influences are discussed. The n and k values are presented as a new reference to modelers who compute the properties of Titan's aerosols and can be used to analyze how the optical properties of these aerosols influence the matching of the observed geometric albedo spectrum.

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