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Mura A, Adriani A, Connerney JEP, Bolton S, Altieri F, Bagenal F, Bonfond B, Dinelli BM, Gérard JC, Greathouse T, Grodent D, Levin S, Mauk B, Moriconi ML, Saur J, Waite JH, Amoroso M, Cicchetti A, Fabiano F, Filacchione G, Grassi D, Migliorini A, Noschese R, Olivieri A, Piccioni G, Plainaki C, Sindoni G, Sordini R, Tosi F, Turrini D. Juno observations of spot structures and a split tail in Io-induced aurorae on Jupiter. Science 2018; 361:774-777. [PMID: 29976795 DOI: 10.1126/science.aat1450] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2018] [Accepted: 06/15/2018] [Indexed: 11/02/2022]
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.
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Affiliation(s)
- A Mura
- Institute for Space Astrophysics and Planetology, National Institute for Astrophysics, Rome, Italy.
| | - A Adriani
- Institute for Space Astrophysics and Planetology, National Institute for Astrophysics, Rome, Italy
| | - J E P Connerney
- Space Research Corporation, Annapolis, MD, USA.,NASA Goddard Space Flight Center, Greenbelt, MD, USA
| | - S Bolton
- Southwest Research Institute, San Antonio, TX, USA
| | - F Altieri
- Institute for Space Astrophysics and Planetology, National Institute for Astrophysics, Rome, Italy
| | - F Bagenal
- Laboratory for Atmospheric and Space Physics, University of Colorado Boulder, Boulder, CO, USA
| | - B Bonfond
- Space Science, Technologies and Astrophysical Research Institute, Laboratory for Planetary and Atmospheric Physics, University of Liège, Liège, Belgium
| | - B M Dinelli
- Institute of Atmospheric Sciences and Climate, National Research Council, Italy
| | - J-C Gérard
- Space Science, Technologies and Astrophysical Research Institute, Laboratory for Planetary and Atmospheric Physics, University of Liège, Liège, Belgium
| | - T Greathouse
- Southwest Research Institute, San Antonio, TX, USA
| | - D Grodent
- Space Science, Technologies and Astrophysical Research Institute, Laboratory for Planetary and Atmospheric Physics, University of Liège, Liège, Belgium
| | - S Levin
- Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA
| | - B Mauk
- Applied Physics Laboratory, Johns Hopkins University, Laurel, MD, USA
| | - M L Moriconi
- Institute of Atmospheric Sciences and Climate, National Research Council, Italy
| | - J Saur
- Institut für Geophysik und Meteorologie, University of Cologne, Köln, Germany
| | - J H Waite
- Southwest Research Institute, San Antonio, TX, USA.,Department of Physics and Astronomy, University of Texas at San Antonio, San Antonio, TX, USA
| | - M Amoroso
- Agenzia Spaziale Italiana, Rome, Italy
| | - A Cicchetti
- Institute for Space Astrophysics and Planetology, National Institute for Astrophysics, Rome, Italy
| | - F Fabiano
- Institute of Atmospheric Sciences and Climate, National Research Council, Italy
| | - G Filacchione
- Institute for Space Astrophysics and Planetology, National Institute for Astrophysics, Rome, Italy
| | - D Grassi
- Institute for Space Astrophysics and Planetology, National Institute for Astrophysics, Rome, Italy
| | - A Migliorini
- Institute for Space Astrophysics and Planetology, National Institute for Astrophysics, Rome, Italy
| | - R Noschese
- Institute for Space Astrophysics and Planetology, National Institute for Astrophysics, Rome, Italy
| | | | - G Piccioni
- Institute for Space Astrophysics and Planetology, National Institute for Astrophysics, Rome, Italy
| | - C Plainaki
- Institute for Space Astrophysics and Planetology, National Institute for Astrophysics, Rome, Italy.,Agenzia Spaziale Italiana, Rome, Italy
| | - G Sindoni
- Agenzia Spaziale Italiana, Rome, Italy
| | - R Sordini
- Institute for Space Astrophysics and Planetology, National Institute for Astrophysics, Rome, Italy
| | - F Tosi
- Institute for Space Astrophysics and Planetology, National Institute for Astrophysics, Rome, Italy
| | - D Turrini
- Institute for Space Astrophysics and Planetology, National Institute for Astrophysics, Rome, Italy
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Grodent D, Bonfond B, Radioti A, Gérard JC, Jia X, Nichols JD, Clarke JT. Auroral footprint of Ganymede. ACTA ACUST UNITED AC 2009. [DOI: 10.1029/2009ja014289] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Denis Grodent
- Institut d'Astrophysique et de Géophysique, Laboratory for Planetary and Atmospheric Physics; Université de Liège; Liège Belgium
| | - Bertrand Bonfond
- Institut d'Astrophysique et de Géophysique, Laboratory for Planetary and Atmospheric Physics; Université de Liège; Liège Belgium
| | - Aikaterini Radioti
- Institut d'Astrophysique et de Géophysique, Laboratory for Planetary and Atmospheric Physics; Université de Liège; Liège Belgium
| | - Jean-Claude Gérard
- Institut d'Astrophysique et de Géophysique, Laboratory for Planetary and Atmospheric Physics; Université de Liège; Liège Belgium
| | - Xianzhe Jia
- Institute of Geophysics and Planetary Physics; University of California; Los Angeles California USA
| | | | - John T. Clarke
- Center for Space Physics; Boston University; Boston Massachusetts USA
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