Four SO2 maps recorded on October 4 and 5, 2012. Left: October 4; top: 19:40; bottom: 20:10. The black circles correspond to the locations of maximum and minimum SO2 abundances where the spectra shown in Fig. 18 have been analyzed. Right: October 5; top: 19:40; bottom: 20:10. We used for SO2 the 529.7 cm-1 doublet, and for CO2 the 529.73 transition (rest frequencies). In all cases, the SO2 spatial distribution appears less patchy than at 7 μm. The two maps of October 5 look very similar, but a strong increase in the SO2 abundance, spread over a large fraction of the disk, appears on the Oct.4, 20:10 UT map.
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