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UV Io footprint leading spot: A key feature for understanding the UV Io footprint multiplicity?

Saur, J.; Bonfond, B.; Gérard, J. -C. +3 more

The electromagnetic interaction between Io and the Jovian magnetosphere generates a UV auroral footprint in both Jovian hemispheres. Multiple spots were observed in the northern Jovian hemisphere when Io was in the northern part of the plasma torus and vice-versa for the South. Based on recent Hubble Space Telescope (HST) measurements, we report h…

Auroral polar dawn spots: Signatures of internally driven reconnection processes at Jupiter's magnetotail

Bonfond, B.; Clarke, J. T.; Gérard, J. -C. +2 more

We report the presence of polar spots located in the dawn auroral region, based on the HST ACS 2007 campaign. We study the location of these features in the equatorial plane as well as their time scales and periodicities, based on a comprehensive series of images taken between February 21 and June 11, 2007. It is shown that the majority of polar d…