Sounding the Martian dust from ISO spectroscopy in the 2.7 MU M CO_2 bands

Details Sounding the Martian dust from ISO spectroscopy in the 2.7 MU M CO_2 bands Sounding the Martian dust from ISO spectroscopy in the 2.7 MU M CO_2 bands

Sep 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999dps....31.7504t&link_type=abstract

American Astronomical Society, DPS meeting #31, #75.04

Astronomy and Astrophysics

Astronomy

Scientific paper

In July--August 1997, the Infrared Space Observatory (ISO) acquired three 2.4--45 mu m spectra of Mars at 1500--2500 spectral resolution. Two out of the three spectra show the presence of weak but non--zero flux level ( (5--8)x10(-3) erg cm(-2) s(-1) sr(-1) /cm(-1) )) in the center of the nu_1 +nu_3 and 2nu_2 +nu_3 bands of CO_2 at 2.69 and 2.77 mu m. This is evidence for aerosol scattering, as models without dust predict zero flux in these saturated bands. Calculations by Titov, Fedorova and Haus (Planet. Space Sci., in press) show that the spectrum at 2.65--2.80 mu m can be used to determine the aerosol optical depth and estimate its vertical distribution. A preliminary examination of the ISO data suggests an optical depth of about 0.1. More refined estimates will be presented, and compared with concommitant (though local) Mars Pathfinder results at visible wavelengths.

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