Mathematics – Logic
Scientific paper
Sep 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998baas...30r1055k&link_type=abstract
American Astronomical Society, DPS meeting #30, #22.P08; Bulletin of the American Astronomical Society, Vol. 30, p.1055
Mathematics
Logic
Scientific paper
Spectra acquired by the 1969 Mariner Mars 7 Infrared Spectrometer (IRS), spanning the wavelength region 1.8-14.4 microns, have recently been recovered and calibrated (Kirkland et al. LPSC XXIX abs. 1516, 1998). Absorptions detected at 2.4, 3, 11.25, and 12.5 microns provide strong spectral evidence for the presence of a hydrous weathering product on the martian surface, interpreted to be goethite. The 11.25 and 12.5 micron bands do not correlate with atmospheric path length, neither do they correlate with 12.6 micron atmospheric CO2 band depth, or the 9 micron atmospheric dust band depth. Thus we ascribe the 11.25 and 12.5 micron bands to the surface. An in-depth examination of the 2.4 and 3 micron band strengths must await completion of the more comprehensive calibration that is currently in progress. The presence of a hydrous weathering product is geologically significant and has important implications for the present and past climate on Mars. These spectral features are consistent with spectra recently returned by the Mars Global Surveyor Thermal Emission Spectrometer (TES), covering 6-50 microns. IRS and TES have similar spectral resolution in the 10 to 13 micron region. The 11.25 and 12.5 micron bands may be examined in IRS spectra directly, but the lower spectral sampling of TES precludes a direct examination of the 12.5 micron band without an atmospheric removal. However, TES spectra exhibit a band at 11.25 microns that matches very well the feature in IRS spectra. Furthermore, TES spectra show a 23 micron band, and this is consistent with the goethite interpretation.
Herr Kenneth C.
Kirkland Laurel Ellyn
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