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Mauduit E, Zarka P, Lamy L, Hess SLG. Drifting discrete Jovian radio bursts reveal acceleration processes related to Ganymede and the main aurora. Nat Commun 2023; 14:5981. [PMID: 37788989 PMCID: PMC10547699 DOI: 10.1038/s41467-023-41617-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2023] [Accepted: 09/07/2023] [Indexed: 10/05/2023] Open
Abstract
Radio detection at high time-frequency resolutions is a powerful means of remotely studying electron acceleration processes. Radio bursts have characteristics (polarization, drift, periodicity) making them easier to detect than slowly variable emissions. They are not uncommon in solar system planetary magnetospheres, the powerful Jovian "short bursts (S-bursts)" induced by the Io-Jupiter interaction being especially well-documented. Here we present a detection method of drifting radio bursts in terabytes of high resolution time-frequency data, applied to one month of ground-based Jupiter observations. Beyond the expected Io-Jupiter S-bursts, we find decameter S-bursts related to the Ganymede-Jupiter interaction and the main Jovian aurora, revealing ubiquitous Alfvénic electron acceleration in Jupiter's high-latitude regions. Our observations show accelerated electron energies are distributed in two populations, kilo-electron-Volts and hundreds of electron-Volts. This detection technique may help characterizing inaccessible astrophysical sources such as exoplanets.
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Affiliation(s)
- Emilie Mauduit
- LESIA, Observatoire de Paris, Université PSL, CNRS, Sorbonne Université, Université de Paris, 5 place Jules Janssen, Meudon, 92195, France
| | - Philippe Zarka
- LESIA, Observatoire de Paris, Université PSL, CNRS, Sorbonne Université, Université de Paris, 5 place Jules Janssen, Meudon, 92195, France.
- Observatoire Radioastronomique de Nançay (ORN), Observatoire de Paris, CNRS, PSL, Université d'Orléans, OSUC, route de Souesmes, Nançay, 18330, France.
| | - Laurent Lamy
- LESIA, Observatoire de Paris, Université PSL, CNRS, Sorbonne Université, Université de Paris, 5 place Jules Janssen, Meudon, 92195, France
- Observatoire Radioastronomique de Nançay (ORN), Observatoire de Paris, CNRS, PSL, Université d'Orléans, OSUC, route de Souesmes, Nançay, 18330, France
- LAM, Pythéas, Pôle Etoile, Aix Marseille Univ, CNRS, CNES, Site de Château Gombert, 13388, Marseille, France
| | - Sébastien L G Hess
- DPHY, ONERA, Université de Toulouse, 2 Avenue Edouard Belin, 31055, Toulouse, France
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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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Yoshioka K, Murakami G, Yamazaki A, Tsuchiya F, Kimura T, Kagitani M, Sakanoi T, Uemizu K, Kasaba Y, Yoshikawa I, Fujimoto M. Evidence for global electron transportation into the jovian inner magnetosphere. Science 2014; 345:1581-4. [PMID: 25258073 DOI: 10.1126/science.1256259] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
Jupiter's magnetosphere is a strong particle accelerator that contains ultrarelativistic electrons in its inner part. They are thought to be accelerated by whistler-mode waves excited by anisotropic hot electrons (>10 kiloelectron volts) injected from the outer magnetosphere. However, electron transportation in the inner magnetosphere is not well understood. By analyzing the extreme ultraviolet line emission from the inner magnetosphere, we show evidence for global inward transport of flux tubes containing hot plasma. High-spectral-resolution scanning observations of the Io plasma torus in the inner magnetosphere enable us to generate radial profiles of the hot electron fraction. It gradually decreases with decreasing radial distance, despite the short collisional time scale that should thermalize them rapidly. This indicates a fast and continuous resupply of hot electrons responsible for exciting the whistler-mode waves.
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Affiliation(s)
- K Yoshioka
- Institute of Space and Astronautical Science (ISAS), Japan Aerospace Exploration Agency (JAXA), Sagamihara, Japan.
| | - G Murakami
- Institute of Space and Astronautical Science (ISAS), Japan Aerospace Exploration Agency (JAXA), Sagamihara, Japan
| | - A Yamazaki
- Institute of Space and Astronautical Science (ISAS), Japan Aerospace Exploration Agency (JAXA), Sagamihara, Japan
| | - F Tsuchiya
- Planetary Plasma and Atmospheric Research Center, Tohoku University, Sendai, Japan
| | - T Kimura
- Institute of Space and Astronautical Science (ISAS), Japan Aerospace Exploration Agency (JAXA), Sagamihara, Japan
| | - M Kagitani
- Planetary Plasma and Atmospheric Research Center, Tohoku University, Sendai, Japan
| | - T Sakanoi
- Planetary Plasma and Atmospheric Research Center, Tohoku University, Sendai, Japan
| | - K Uemizu
- Institute of Space and Astronautical Science (ISAS), Japan Aerospace Exploration Agency (JAXA), Sagamihara, Japan. National Astronomical Observatory of Japan, Mitaka, Japan
| | - Y Kasaba
- Department of Geophysics, Tohoku University, Sendai, Japan
| | - I Yoshikawa
- Department of Earth and Planetary Science, University of Tokyo, Tokyo, Japan
| | - M Fujimoto
- Institute of Space and Astronautical Science (ISAS), Japan Aerospace Exploration Agency (JAXA), Sagamihara, Japan. Earth-Life Science Institute, Tokyo Institute of Technology, Tokyo, Japan
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