IRTF/MIRSI radiance observations at 7.8 μm in the ν₄ rotational-vibrational band of methane, carried out on 25 June−1 July 2010 (top) and 5−6 December 2010 (bottom). These observations are essentially sensitive to the stratospheric temperature between 1 and 40 mbar. The color scale gives the correspondence between radiances and stratospheric temperatures at 2 mbar, according to our derivation procedure (see text for limitations). These maps suggest that the northern hemisphere is generally warmer than the southern hemisphere. The bright belt seen around 15 °S in both maps (as well as in the TEXES data; see Fig. 9) is a possible explanation for the ~4 K increase seen in the PACS 66.4 μm map between the equator and 25 °S. The bright dot seen in the 25 June−1 July 2010 map is Io and had only marginal effects on the zonal mean results.