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Vogt MF, Connerney JEP, DiBraccio GA, Wilson RJ, Thomsen MF, Ebert RW, Clark GB, Paranicas C, Kurth WS, Allegrini F, Valek PW, Bolton SJ. Magnetotail Reconnection at Jupiter: A Survey of Juno Magnetic Field Observations. JOURNAL OF GEOPHYSICAL RESEARCH. SPACE PHYSICS 2020; 125:e2019JA027486. [PMID: 32874821 PMCID: PMC7458104 DOI: 10.1029/2019ja027486] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/27/2019] [Accepted: 02/24/2020] [Indexed: 05/24/2023]
Abstract
At Jupiter, tail reconnection is thought to be driven by an internal mass loading and release process called the Vasyliunas cycle. Galileo data have shown hundreds of reconnection events occurring in Jupiter's magnetotail. Here we present a survey of reconnection events observed by Juno during its first 16 orbits of Jupiter (July 2016-October 2018). The events are identified using Juno magnetic field data, which facilitates comparison to the Vogt et al. (2010, https://doi.org/10.1029/2009JA015098) survey of reconnection events from Galileo magnetometer data, but we present data from Juno's other particle and fields instruments for context. We searched for field dipolarizations or reversals and found 232 reconnection events in the Juno data, most of which featured an increase in |B θ |, the magnetic field meridional component, by a factor of 3 over background values. We found that most properties of the Juno reconnection events, like their spatial distribution and duration, are comparable to Galileo, including the presence of a ~3-day quasi-periodicity in the recurrence of Juno tail reconnection events and in Juno JEDI, JADE, and Waves data. However, unlike with Galileo we were unable to clearly define a statistical x-line separating planetward and tailward Juno events. A preliminary analysis of plasma velocities during five magnetic field reconnection events showed that the events were accompanied by fast radial flows, confirming our interpretation of these magnetic signatures as reconnection events. We anticipate that a future survey covering other Juno datasets will provide additional insight into the nature of tail reconnection at Jupiter.
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Affiliation(s)
- Marissa F Vogt
- Center for Space Physics, Boston University, Boston, MA, USA
| | | | | | - Rob J Wilson
- Laboratory for Atmospheric and Space Physics, University of Colorado, Boulder, CO, USA
| | | | - Robert W Ebert
- Southwest Research Institute, San Antonio, TX, USA
- Department of Physics and Astronomy, University of Texas at San Antonio, San Antonio, TX, USA
| | - George B Clark
- The Johns Hopkins University Applied Physics Laboratory, Johns Hopkins University, Laurel, MD, USA
| | - Christopher Paranicas
- The Johns Hopkins University Applied Physics Laboratory, Johns Hopkins University, Laurel, MD, USA
| | - William S Kurth
- Department of Physics and Astronomy, University of Iowa, Iowa City, IA, USA
| | - Frédéric Allegrini
- Southwest Research Institute, San Antonio, TX, USA
- Department of Physics and Astronomy, University of Texas at San Antonio, San Antonio, TX, USA
| | - Phil W Valek
- Southwest Research Institute, San Antonio, TX, USA
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Jackman CM, Lamy L, Freeman MP, Zarka P, Cecconi B, Kurth WS, Cowley SWH, Dougherty MK. On the character and distribution of lower-frequency radio emissions at Saturn and their relationship to substorm-like events. ACTA ACUST UNITED AC 2009. [DOI: 10.1029/2008ja013997] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- C. M. Jackman
- Blackett Laboratory; Imperial College London; London UK
| | - L. Lamy
- LESIA, Observatoire de Paris; Université Paris Diderot, UPMC, CNRS; Meudon France
| | | | - P. Zarka
- LESIA, Observatoire de Paris; Université Paris Diderot, UPMC, CNRS; Meudon France
| | - B. Cecconi
- LESIA, Observatoire de Paris; Université Paris Diderot, UPMC, CNRS; Meudon France
| | - W. S. Kurth
- Department of Physics and Astronomy; University of Iowa; Iowa City Iowa USA
| | - S. W. H. Cowley
- Department of Physics and Astronomy; University of Leicester; Leicester UK
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André N. Low-frequency waves and instabilities in stratified, gyrotropic, multicomponent plasmas: Theory and application to plasma transport in the Io torus. ACTA ACUST UNITED AC 2004. [DOI: 10.1029/2004ja010599] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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