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It has been proposed that short-timescale fluctuations about the meanelectric field can significantly increase the upper atmospheric energy inputsat Jupiter, which may help to explain the high observed thermospherictemperatures. We present data from the first attempt to detect suchvariations in the Jovian ionosphere. Line-of-sight ionospheric velocityprofiles in the Southern Jovian auroral/polar region are shown, derived fromthe Doppler shifting of H<sub>3</sub><sup>+</sup> infrared emission spectra. These datawere recently obtained from the high-resolution CSHELL spectrometer at theNASA Infrared Telescope Facility. We find that there is no variability withinthis data set on timescales of the order of one minute and spatial scales of640 km, putting upper limits on the timescales of fluctuations that would beneeded to enhance Joule heating

Variability of Jovian ion winds: an upper limit for enhanced Joule heating