Supersonic winds in Jupiter's aurorae

Daniel Rego, Nicholas Achilleos, Tom Stallard, Steve Miller (), Renée Prangé, Michele Dougherty and Robert D. Joseph
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Daniel Rego: University College London
Nicholas Achilleos: University College London
Tom Stallard: University College London
Steve Miller: University College London
Renée Prangé: Institut d'Astrophysique Spatiale
Michele Dougherty: Space and Atmospheric Physics, Imperial College
Robert D. Joseph: Institute for Astronomy, University of Hawaii

Nature, 1999, vol. 399, issue 6732, 121-124

Abstract: Abstract Jupiter has a giant magnetosphere that is coupled to the planet's upper atmosphere; as the planet rotates, its magnetic field drags a dense ionized equatorial sheet of plasma, which must interact with the upper atmosphere. Jupiter's aurorae are much more powerful1,2 than the Earth's, and cause significant local heating of the upper atmosphere. Auroral electrojets—ion winds that race around Jupiter's auroral ovals—play a key role in theoretical models of how Jupiter's rotational energy is transferred to the plasma sheet3,4 and how winds may transport energy from auroral heating to lower latitudes5,6,7. But there has hitherto been no direct observational evidence for the existence of such electrojets. Here we report observations of electrojets that have winds approaching or in excess of the local speed of sound. The energy produced by these electrojets could heat the whole upper atmosphere, if the auroral regions couple efficiently with the rest of the planet.

Date: 1999
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DOI: 10.1038/20121

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