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Compositional Mapping of Europa Using MCMC Modeling of Near-IR VLT/SPHERE and Galileo/NIMS Observations

  • Authors: Oliver King, Leigh N. Fletcher, Nicolas Ligier

Oliver King et al 2022 The Planetary Science Journal 3 .

  • Provider: AAS Journals

Caption: Figure 6.

Normalized 1.50 μm/1.36 μm spectral ratio for SPHERE and NIMS observations. The NIMS data are a combination of the data sets in Table 2; in regions where the observations overlap, the median reflectance value is used. Blue areas in the map indicate stronger absorption at 1.50 μm, generally implying a higher water-ice abundance, and red areas indicate reduced water-ice abundance. The graph on the left shows reflectance spectra for a range of water-ice grain sizes (darker lines indicate smaller ice grains; see Figure 8) normalized to unity at 1.36 μm. The choice of ratio wavelengths measures the full relative depth of the 1.5 μm absorption and produces a map ratio that is mainly affected by ice abundance (rather than grain size).

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