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The main auroral emission at Jupiter generally appears as a quasi-closedcurtain centered around the magnetic pole. This auroral feature, whichaccounts for approximately half of the total power emitted by the aurorae inthe ultraviolet range, is related to corotation enforcement currents in themiddle magnetosphere. Early models for these currents assumed axisymmetry,but significant local time variability is obvious on any image of the Jovianaurorae. Here we use far-UV images from the Hubble Space Telescope to furthercharacterize these variations on a statistical basis. We show that the duskside sector is ~ 3 times brighter than the dawn side in the southernhemisphere and ~ 1.1 brighter in the northern hemisphere, where themagnetic anomaly complicates the interpretation of the measurements. Wesuggest that such an asymmetry between the dawn and the dusk sectors could bethe result of a partial ring current in the nightsidemagnetosphere

The far-ultraviolet main auroral emission at Jupiter – Part 1: Dawn–dusk brightness asymmetries