Planetary isophotes as a clue to aerosol characteristics

Details Planetary isophotes as a clue to aerosol characteristics Planetary isophotes as a clue to aerosol characteristics

Dec 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975stin...7617006k&link_type=abstract

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Computer Science

Aerosols, Isophotes, Mars Atmosphere, Light Scattering, Mariner 9 Space Probe, Minerals, Particle Size Distribution, Photometry, Spacecraft Television

Scientific paper

A study was conducted to see how much information could be extracted from the Mariner 9 Mars isophotes taken at a phase angle of approximately 60 deg. It was found that the Minnaert functions and both isotropic and Rayleigh scattering could easily be ruled out, and that it was essential to use forward-peaked phase functions, which were computed from Mie theory. Isophotes similar to those observed assuming a semi-infinite dust cloud with a considerable variation in particle properties and size distribution could be obtained, so long as the ratio of the multiply- to singly-scattered light was held within certain limits. These conditions are met by micron-sized, moderatly absorbing mineral grains whose mean size should not be much larger than a micron. It was also found that a dust cloud of finite optical thickness bounded from below by a Lambert ground would fit the isophote data.

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