AbstractThe SPICAM UV spectrometer onboard Mars Express observed two regional dust storms: on October 24, 2005, near Argyre Planitia and on July 9, 2005, in Hellas Planitia. The measurements were performed in nadir mode. The spectral domain 210–310nm is considered. A comparison with a prior orbit which passed above almost the same path 6 days before the storm near Argyre Planitia has shown a significant decrease of the radiance factor. The difference grows at shorter wavelengths and shows significant dust absorption in the UV. The data have been used to retrieve the dust optical thickness τ, single scattering albedo w and asymmetry factor g. The fitting of the spectra by a radiative transfer code has revealed a set of solutions which could be constrained by Mie modeling of the parameters τ, w, and g for a gamma particle size distribution. The following estimates of the dust optical parameters are obtained: w=0.64±0.04 at λ=300nm and decreases to 0.6±0.045 at 213nm, g=0.86±0.03 at 300nm and slightly grows to 0.88±0.04 at 213nm, τ=2.5±0.5 for the first dust event and τ=2.0±0.5 for the second one. The obtained values of single scattering albedo are consistent with the Hubble Space Telescope and Mariner 9 results.
Detection of Martian dust clouds by SPICAM UV nadir measurements during the October 2005 regional dust storm
Advances in Space Research ; 40 , 6 ; 869-880
2007-06-16
12 pages
Article (Journal)
Electronic Resource
English
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