Physics
Scientific paper
Mar 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3306201g&link_type=abstract
Geophysical Research Letters, Volume 33, Issue 6, CiteID L06201
Physics
6
Magnetospheric Physics: Auroral Phenomena (2407), Magnetospheric Physics: Energetic Particles: Precipitating, Magnetospheric Physics: Planetary Magnetospheres (5443, 5737, 6033), Planetary Sciences: Solar System Objects: Jupiter, Planetary Sciences: Solar System Objects: Europa
Scientific paper
Ultraviolet images of Jupiter's northern aurora obtained in 2005 confirm the existence of an electromagnetic interaction between Europa and the Jovian ionosphere. The auroral signature shows a two-component structure: a quasi-circular Europa spot, followed by a previously undetected faint tail emission trailing in the direction of corotation flow. The characteristic brightness for the auroral spot is ~14 +/- 1 kR above background, and approximately 7 +/- 1 kR for the tail. The spot's size is ~1100 km, magnetically mapping to an interaction region <=15 Europa diameters. The auroral tail extends over ~5000 km, which maps along a region of at least 70 Europa diameters. The ultraviolet power emitted by both components varies from a fraction to several GW. The present study suggests auroral interaction at Europa similar to that at Io, but scaled-down by an order of magnitude, including a sub-corotating plasma plume in the geometrical wake of Europa.
Clarke John T.
Connerney Jack E. P.
Gérard Jean-Claude
Grodent Denis
Gustin Jacques
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