New calibrated spectral observations and modelling of Europa from Galileo/NIMS

Physics

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Scientific paper

The Near Infrared Mapping Spectrometer (NIMS) observations at wavelengths 0.7-5.3 μm of the Jovian moon Europa are being reprocessed using information gained throughout and beyond the Galileo mission. Early analysis of these reprocessed data (three observations, including a global scale one of the anti- Jovian and trailing hemispheres at 47 km spatial resolution) show evidence of spectral features not or only weakly apparent before [1]. These include strong absorption bands attributed to CO2 and SO2 (centered near 4.25 and 4.0 μm, respectively). The strong hydrate bands, including at near 1.5 and 1.95 μm, are now more clearly defined. The largest amounts of CO2 and the most well defined hydrate bands are strongly associated with the (endogenic) dark reddish regions on the surface [1, 2]. We will present results from newly calibrated observations that we are currently working on.

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