THE DE-STRIPING OF THE VIMS-V IMAGES AND THE OBSERVATIONS OF HCN LIMB EMISSION IN THE TITAN ATMOSPHERE AT 3 um

In this paper two dierent tools for the analysis of VIMS hyperspectral images will be presented. A statistical methodology has been realized to correct the striped appearance of the VIMS-V images. This destriping procedure applies to each pixel of the images in the visible range and can be used both for the raw and calibrated data. Respect to their original values, the 60% of the destriped pixels fall in a 1% range, the 93% fall in a 2% range and finally all the pixels fall in a 3% range. A second tool regarded the detection of minor species at dierent heights, as suggested by the check of the VIMS-IR images for the Titan's limb at high phase angles. The spectral examination of the image pixels at the limb emphasized three features at 3.03, 3.33 e 4.78 m, assigned by the literature to HCN and CH4 fluorescence and to a probable CO thermal emission respectively. An estimation of the maximum concentration level for the three species has been done by combining a simple algorithm and easy geometrical calculations.