Physics
Scientific paper
Jul 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009jgra..11407212g&link_type=abstract
Journal of Geophysical Research, Volume 114, Issue A7, CiteID A07212
Physics
5
Planetary Sciences: Solar System Objects: Ganymede, Planetary Sciences: Solar System Objects: Jupiter, Magnetospheric Physics: Auroral Phenomena (2407), Planetary Sciences: Fluid Planets: Magnetospheres (2756), Magnetospheric Physics: Planetary Magnetospheres (5443, 5737, 6033)
Scientific paper
The interaction of Ganymede with Jupiter's fast rotating magnetospheric plasma gives rise to a current system producing an auroral footprint in Jupiter's ionosphere, usually referred to as the Ganymede footprint. Based on an analysis of ultraviolet images obtained with the Hubble Space Telescope, we demonstrate that the auroral footprint surface matches a circular region in Ganymede's orbital plane having a diameter of 8-20 RG. Temporal analysis of the auroral power of Ganymede's footprint reveals variations of different timescales: (1) a 5-hour timescale associated with the periodic flapping of Jupiter's plasma sheet over Ganymede, (2) a 10-40 minute timescale possibly associated with energetic magnetospheric events, such as plasma injections, and (3) a 100-s timescale corresponding to quasiperiodic fluctuations, which might relate to bursty reconnections on Ganymede's magnetopause and/or to the recurrent presence of acceleration structures above Jupiter's atmosphere. These three temporal components produce an auroral power emitted at Ganymede's footprint of the order of ˜0.2 to ˜1.5 GW.
Bonfond Bertrand
Clarke John T.
Gérard Jean-Claude
Grodent Denis
Jia Xianzhe
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