Observation of short timescale variability of the Jovian UV aurora

Mathematics – Logic

Scientific paper

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Hst Proposal Id #6662 Solar System

Scientific paper

Previous FOC and WFPC2 observations have shown the very complex morphological structure of the Jovian UV aurora and its unexpectedly strong temporal variations. They {and other IUE and Voyager UVS observations} suggest that time variations occur on different timescales. Some of the auroral structures deduced from previous images may be the result of a time averaging of short-lived auroral features. We propose to image the short time variations {minutes} of the ultraviolet Jovian auroral morphology and brightness with WFPC2. Exposures will be made near central meridian longitudes {CMLs} = 180 degrees in order to get the best view of the northern auroral zone. The question of temporal variability is of major importance in understanding the origin and acceleration mechanisms of the auroral particles exciting the Jovian UV aurora.

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