Aerosol characteristics in the Martian atmosphere according to KRFM data.

Details Aerosol characteristics in the Martian atmosphere according to KRFM data. Aerosol characteristics in the Martian atmosphere according to KRFM data.

May 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991cosre..28..804m&link_type=abstract

Cosmic Res., Vol. 28, No. 6, p. 804 - 809

Physics

Mars Atmosphere: Aerosols, Mars Atmosphere: Photometry, Mars Surface: Photometry

Scientific paper

Photometric profiles of Mars in the equatorial zone were obtained in eight narrow spectral bands from 320 to 550 nm. First results of an analysis of photometric properties of the atmosphere and surface are presented. The imaginary part of the refractive index of "constant" dust haze was estimated to be from 0.02 to 0.04 for 320 nm, and <0.01 for 550 nm. The optical thickness was 0.3, almost independent of wavelength. The material's absorbing properties can be formally explained by the presence of basaltic rocks with some admixture of goethite (2 - 3%). Particle sizes of a new tenths of a micron having the real part of their refractive index 1.55 satisfy the assumed optical model of constant dust. Particles of approximately the same average size but with a narrower size distribution, with n = 1.31, κ = 0 (water ice), and τ ≅ 0.15, can explain the bright spot over Arsia Mons. The quantity of ice in a column of unit cross section was 10-4g·cm-2. The surface smoothness factor q varied from 0 at 320 nm to 0.5 at 550 nm.

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