SO2/CO2 maps recorded on October 5, 2012. Right: map obtained using the SO2 line at 1345.28 cm-1; middle: map obtained using the SO2 doublet at 1345.12 cm-1; in both cases, the CO2 line at 1345.22 cm-1 was used for comparison. Left: average of the two maps. Top: Oct.5, 16:55; bottom: Oct. 5, 18:35. In spite of the limited signal-to-noise ratio, due to poor atmospheric conditions, there is evidence for actual temporal variations on timescales less than two hours.
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