Computer Science
Scientific paper
Jan 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976icar...27...55p&link_type=abstract
Icarus, vol. 27, Jan. 1976, p. 55-67.
Computer Science
9
Dust Storms, Mariner 9 Space Probe, Mars Surface, Particle Size Distribution, Refractivity, Ultraviolet Spectroscopy, Absorption Spectra, Albedo, Mie Scattering, Spectrum Analysis, Ultraviolet Absorption
Scientific paper
Mariner 9 ultraviolet spectrometer observations of the 1971 dust clouds obscuring the surface of Mars have been analyzed by matching the observed dust phase function with Mie scattering calculations for size distributions of homogeneous and isotropic material. Preliminary results indicate an effective particle radius of not less than 0.2. The real component of the index of refraction is not less than 1.8 at both 268 and 305 nm; corresponding values for the imagery component are 0.02 and 0.01. These values are consistent with those found by Mead (1970) for the visible and near-visible wavelengths. The refractive index and the absorption coefficient increase rapidly with decreasing wavelength in going from the visible to the ultraviolet, indicating the presence of an ultraviolet absorption band which may shield organisms from ultraviolet irradiation.
Ajello Joseph M.
Egan Walter G.
Hord Charles W.
Pang Kenneth
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