Bright, Dark Region, and Atmospheric Transmission TES Signatures, LPSC 2002

These values are in our LPSC 2002 abstract (in Adobe PDF) in Figures 1 and 2. The Figure 2 spectra have had an atmospheric compensation (called ISAC) applied, and are of a brighter and darker region on Mars. The Figure 1 spectrum shows the atmospheric transmission signature derived from TES data. The abstract gives details of the data and references for the ISAC method.

The data are:
-1. Brighter region, in apparent emissivity with respect to 7.75 microns (channel #109). Choosing a fixed reference wavenumber to have an emissivity=1 causes apparent emissivity values greater than one at some wavelengths. The first 5 values (channels) should be ignored because they do not contain real data. Matching TES wavenumber values are here.

-2. Dark region, in apparent emissivity with respect to 7.75 microns (channel #109). Choosing a fixed reference wavenumber to have an emissivity=1 causes apparent emissivity values greater than one at some wavelengths. This spectrum exhibits a continuum slope toward longer wavelengths (smaller wavenumber and smaller channel number) that may be caused by an instrumental problem or an undetermined difficulty with the atmospheric compensation. Both raw and atmospherically compensated TES apparent emissivity spectra exhibit this slope. The first 5 values (channels) should be ignored because they do not contain real data. Matching TES wavenumber values are here.

-3. Atmospheric transmission, in apparent transmission with respect to 7.75 microns (channel #109). Choosing a fixed reference wavenumber to have transmission=1 causes apparent transmission values greater than one at some wavelengths. This spectrum exhibits a continuum slope toward longer wavelengths (smaller wavenumber and smaller channel number) that may be caused by an instrumental problem or an undetermined difficulty with the atmospheric compensation. Both raw and atmospherically compensated TES apparent emissivity spectra exhibit this slope. The first 5 values are zeros that should be ignored because those channels do not contain real data. Matching TES wavenumber values are here.



The data may be freely used, but please reference:
Kirkland, L. E., K. C. Herr, J. Ward, E. R. Keim, J. H. Hackwell, J. M. McAfee, Surface composition of Mars: Results from a new atmospheric compensation technique applied to TES, Lunar Planet. Sci. Conf., abs. 1220, 2002.

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