On February 15, 1992, from 0638 to 1023 UT, a single emission feature at 2.104 μm was observed over a wide area on Jupiter, covering much of the southern hemisphere. The emission was observed from the south limb to the equator along the central meridian at longitudes from 72¿ to 207¿ but appeared to be absent in the northern hemisphere. The emission was widespread in longitude, in that it was also visible at both the east and west limbs on a latitudinal chord 6 arc sec from the southern limb when the central meridian longitude was 189¿--207¿. The emission was not detected during the following two nights of the run. The wavelength is consistent with the l=3 to l=0 transition of the quasibound H2 dimer double transition Q1(1)+S0(1). No other emission features were detected. ¿ American Geophysical Union 1992