Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977icar...30..367k&link_type=abstract
Icarus, vol. 30, Feb. 1977, p. 367-376.
Astronomy and Astrophysics
Astronomy
Aerosols, Astronomical Photometry, Dust Storms, Isophotes, Mariner 9 Space Probe, Mars Atmosphere, Computer Techniques, Curve Fitting, Data Reduction, Isotropic Media, Light Scattering, Mie Scattering, Optical Thickness, Particle Size Distribution, Phase Shift, Rayleigh Scattering, Spacecraft Television
Scientific paper
A study was made to see how much information could be extracted from the Mariner 9 Mars isophotes taken at phase angle roughly 60 deg. Minnaert functions and both isotropic and Rayleigh scattering could easily be ruled out, and it was essential to use forward-peaked phase functions computed from Mie theory. Isophotes similar to those observed are plotted assuming a semi-infinite dust cloud with a considerable variation in particle properties and size distribution, so long as the ratio of the multiply to singly scattered light is held within certain limits. These conditions are met by micron-sized, moderately 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.
Kattawar George W.
Young Thomas A.
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