Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993p%26ss...41..569m&link_type=abstract
Planetary and Space Science (ISSN 0032-0633), vol. 41, no. 8, p. 569-585
Astronomy and Astrophysics
Astronomy
15
Brightness, Ice, Iron Oxides, Mars (Planet), Mars Atmosphere, Mars Surface, Molecular Clouds, Optical Thickness, Refractivity, Spectrum Analysis, Approximation, Astronomical Photometry, Depth Measurement, Mars Volcanoes, Size Distribution, Space Missions, Spaceborne Experiments, Surface Properties
Scientific paper
A new analysis of the data of the KRFM experiment (Phobos mission) is presented. The five complete photometric profiles (eight wavelengths for each) obtained in this experiment have been processed, and the calibration and the method of modelling calculations have been specified. The optical depth of the constant haze has been estimated to be within the range 0.1 less than tau less than 0.2. This is essentially smaller than the value predicted for the same reason on the basis of the Viking landers' measurements. The imaginary part of the refraction index of the particles in the constant haze changes smoothly from 0.015 at 315 nm to 0.005 at 550 nm. This behavior corresponds to some basaltic material, containing several percent of iron oxides (limonite, geothite, hematite). Their presence in the Martian soil was recognized a long time ago, but our study gives some new quantitative estimations of Fe2O3 content. The clouds above the large volcanoes have an optical depth approximately 0.1 and contain about 5 x 10-6 g/sq cm of ice particles. All the evaluations of the constant haze particles' properties have been made assuming a gamma size distribution of particles with modal radius rm = 0.4 microns and alpha = gamma = 1. For the description of the surface's photometric properties in the whole range 315-550 nm, the roughness factor q = 0.5 is acceptable as a first approximation, although one cannot exclude that q rises with increasing wavelength. The averaged radius of the optically active particles of the surface has been evaluated as 6-7 microns.
Ksanfomality Leonid V.
Moroz Vasiliy Ivanovich
Petrova Elena V.
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