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Juno observations of spot structures and a split tail in Io-induced aurorae on Jupiter

Journal
Date Issued
2018
Author(s)
•
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Connerney, J. E. P.
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Bolton, S.
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Bagenal, F.
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Bonfond, B.
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Dinelli, B. M.
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Gérard, J. -C.
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Greathouse, T.
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Grodent, D.
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Levin, S.
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Mauk, B.
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Moriconi, M. L.
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Saur, J.
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Waite, J. H.
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Amoroso, M.
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Fabiano, F.
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Olivieri, A.
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Plainaki, C.
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Sindoni, G.
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•
•
DOI
Abstract
Jupiter’s aurorae are produced in its upper atmosphere when incoming high-energy electrons precipitate along the planet’s magnetic field lines. A northern and a southern main auroral oval are visible, surrounded by small emission features associated with the Galilean moons. We present infrared observations, obtained with the Juno spacecraft, showing that in the case of Io, this emission exhibits a swirling pattern that is similar in appearance to a von Kármán vortex street. Well downstream of the main auroral spots, the extended tail is split in two. Both of Ganymede’s footprints also appear as a pair of emission features, which may provide a remote measure of Ganymede’s magnetosphere. These features suggest that the magnetohydrodynamic interaction between Jupiter and its moon is more complex than previously anticipated.
Volume
361
Issue
6404
Start page
774
Uri
Url
Issn Identifier
0036-8075
Ads BibCode
2018Sci...361..774M
Rights
open.access
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