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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 DOI: 10.1029/2018ja026169] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/12/2018] [Accepted: 07/29/2019] [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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Pilkington NM, Achilleos N, Arridge CS, Guio P, Masters A, Ray LC, Sergis N, Thomsen MF, Coates AJ, Dougherty MK. Internally driven large-scale changes in the size of Saturn's magnetosphere. JOURNAL OF GEOPHYSICAL RESEARCH. SPACE PHYSICS 2015; 120:7289-7306. [PMID: 27867793 PMCID: PMC5111417 DOI: 10.1002/2015ja021290] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2015] [Revised: 07/22/2015] [Accepted: 07/26/2015] [Indexed: 05/20/2023]
Abstract
Saturn's magnetic field acts as an obstacle to solar wind flow, deflecting plasma around the planet and forming a cavity known as the magnetosphere. The magnetopause defines the boundary between the planetary and solar dominated regimes, and so is strongly influenced by the variable nature of pressure sources both outside and within. Following from Pilkington et al. (2014), crossings of the magnetopause are identified using 7 years of magnetic field and particle data from the Cassini spacecraft and providing unprecedented spatial coverage of the magnetopause boundary. These observations reveal a dynamical interaction where, in addition to the external influence of the solar wind dynamic pressure, internal drivers, and hot plasma dynamics in particular can take almost complete control of the system's dayside shape and size, essentially defying the solar wind conditions. The magnetopause can move by up to 10-15 planetary radii at constant solar wind dynamic pressure, corresponding to relatively "plasma-loaded" or "plasma-depleted" states, defined in terms of the internal suprathermal plasma pressure.
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Affiliation(s)
- N. M. Pilkington
- Atmospheric Physics Laboratory, Department of Physics and AstronomyUniversity College LondonLondonUK
- The Centre for Planetary SciencesUCL/BirkbeckLondonUK
| | - N. Achilleos
- Atmospheric Physics Laboratory, Department of Physics and AstronomyUniversity College LondonLondonUK
- The Centre for Planetary SciencesUCL/BirkbeckLondonUK
| | | | - P. Guio
- Atmospheric Physics Laboratory, Department of Physics and AstronomyUniversity College LondonLondonUK
- The Centre for Planetary SciencesUCL/BirkbeckLondonUK
| | - A. Masters
- Blackett LaboratoryImperial College LondonLondonUK
| | - L. C. Ray
- Atmospheric Physics Laboratory, Department of Physics and AstronomyUniversity College LondonLondonUK
- The Centre for Planetary SciencesUCL/BirkbeckLondonUK
| | - N. Sergis
- Academy of AthensOffice of Space Research and TechnologyAthensGreece
| | | | - A. J. Coates
- The Centre for Planetary SciencesUCL/BirkbeckLondonUK
- Mullard Space Science Laboratory, Department of Space and Climate PhysicsUniversity College LondonDorkingUK
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Orbital apocenter is not a sufficient condition for HST/STIS detection of Europa's water vapor aurora. Proc Natl Acad Sci U S A 2014; 111:E5123-32. [PMID: 25404343 DOI: 10.1073/pnas.1416671111] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
We report far-ultraviolet observations of Jupiter's moon Europa taken by Space Telescope Imaging Spectrograph (STIS) of the Hubble Space Telescope (HST) in January and February 2014 to test the hypothesis that the discovery of a water vapor aurora in December 2012 by local hydrogen (H) and oxygen (O) emissions with the STIS originated from plume activity possibly correlated with Europa's distance from Jupiter through tidal stress variations. The 2014 observations were scheduled with Europa near the apocenter similar to the orbital position of its previous detection. Tensile stresses on south polar fractures are expected to be highest in this orbital phase, potentially maximizing the probability for plume activity. No local H and O emissions were detected in the new STIS images. In the south polar region where the emission surpluses were observed in 2012, the brightnesses are sufficiently low in the 2014 images to be consistent with any H2O abundance from (0-5)×10(15) cm(-2). Large high-latitude plumes should have been detectable by the STIS, independent of the observing conditions and geometry. Because electron excitation of water vapor remains the only viable explanation for the 2012 detection, the new observations indicate that although the same orbital position of Europa for plume activity may be a necessary condition, it is not a sufficient condition. However, the December 2012 detection of coincident HI Lyman-α and OI 1304-Å emission surpluses in an ∼200-km high region well separated above Europa's limb is a firm result and not invalidated by our 2014 STIS observations.
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Siscoe GL. On the equatorial confinement and velocity space distribution of satellite ions in Jupiter's magnetosphere. ACTA ACUST UNITED AC 2012. [DOI: 10.1029/ja082i010p01641] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Bagenal F, Sullivan JD. Direct plasma measurements in the Io torus and inner magnetosphere of Jupiter. ACTA ACUST UNITED AC 2012. [DOI: 10.1029/ja086ia10p08447] [Citation(s) in RCA: 253] [Impact Index Per Article: 21.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Richardson JD, Siscoe GL. Factors governing the ratio of inward to outward diffusing flux of satellite ions. ACTA ACUST UNITED AC 2012. [DOI: 10.1029/ja086ia10p08485] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Scudder JD, Sittler EC, Bridge HS. A survey of the plasma electron environment of Jupiter: A view from Voyager. ACTA ACUST UNITED AC 2012. [DOI: 10.1029/ja086ia10p08157] [Citation(s) in RCA: 284] [Impact Index Per Article: 23.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Roederer JG, Acuña MH, Ness NF. Jupiter's internal magnetic field geometry relevant to particle trapping. ACTA ACUST UNITED AC 2012. [DOI: 10.1029/ja082i032p05187] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Hill TW, Dessler AJ. Longitudinal asymmetry of the Jovian magnetosphere and the periodic escape of energetic particles. ACTA ACUST UNITED AC 2012. [DOI: 10.1029/ja081i019p03383] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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McNutt RL, Belcher JW, Bridge HS. Positive ion observations in the middle magnetosphere of Jupiter. ACTA ACUST UNITED AC 2012. [DOI: 10.1029/ja086ia10p08319] [Citation(s) in RCA: 162] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Thomsen MF, Goertz CK, Van Allen JA. On determining magnetospheric diffusion coefficients from the observed effects of Jupiter's satellite Io. ACTA ACUST UNITED AC 2012. [DOI: 10.1029/ja082i035p05541] [Citation(s) in RCA: 96] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Lazarus AJ, McNutt RL. Low-energy plasma ion observations in Saturn's magnetosphere. ACTA ACUST UNITED AC 2012. [DOI: 10.1029/ja088ia11p08831] [Citation(s) in RCA: 99] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Ray LC, Galand M, Moore LE, Fleshman B. Characterizing the limitations to the coupling between Saturn's ionosphere and middle magnetosphere. ACTA ACUST UNITED AC 2012. [DOI: 10.1029/2012ja017735] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Szego K, Nemeth Z, Erdos G, Foldy L, Thomsen M, Delapp D. The plasma environment of Titan: The magnetodisk of Saturn near the encounters as derived from ion densities measured by the Cassini/CAPS plasma spectrometer. ACTA ACUST UNITED AC 2011. [DOI: 10.1029/2011ja016629] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- K. Szego
- KFKI Research Institute for Particle and Nuclear Physics; Budapest Hungary
| | - Z. Nemeth
- KFKI Research Institute for Particle and Nuclear Physics; Budapest Hungary
| | - G. Erdos
- KFKI Research Institute for Particle and Nuclear Physics; Budapest Hungary
| | - L. Foldy
- KFKI Research Institute for Particle and Nuclear Physics; Budapest Hungary
| | - M. Thomsen
- Los Alamos National Laboratory; Los Alamos New Mexico USA
| | - D. Delapp
- Los Alamos National Laboratory; Los Alamos New Mexico USA
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Bagenal F, Delamere PA. Flow of mass and energy in the magnetospheres of Jupiter and Saturn. ACTA ACUST UNITED AC 2011. [DOI: 10.1029/2010ja016294] [Citation(s) in RCA: 222] [Impact Index Per Article: 17.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Fran Bagenal
- Laboratory for Atmospheric and Space Physics; University of Colorado at Boulder; Boulder Colorado USA
| | - Peter A. Delamere
- Laboratory for Atmospheric and Space Physics; University of Colorado at Boulder; Boulder Colorado USA
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Sergis N, Arridge CS, Krimigis SM, Mitchell DG, Rymer AM, Hamilton DC, Krupp N, Dougherty MK, Coates AJ. Dynamics and seasonal variations in Saturn's magnetospheric plasma sheet, as measured by Cassini. ACTA ACUST UNITED AC 2011. [DOI: 10.1029/2010ja016180] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- N. Sergis
- Office of Space Research and Technology; Academy of Athens; Athens Greece
| | - C. S. Arridge
- Mullard Space Science Laboratory, Department of Space and Climate Physics; University College London; London UK
- Centre for Planetary Sciences at UCL/Birkbeck; London UK
| | - S. M. Krimigis
- Office of Space Research and Technology; Academy of Athens; Athens Greece
- Johns Hopkins University Applied Physics Laboratory; Laurel Maryland USA
| | - D. G. Mitchell
- Johns Hopkins University Applied Physics Laboratory; Laurel Maryland USA
| | - A. M. Rymer
- Johns Hopkins University Applied Physics Laboratory; Laurel Maryland USA
| | - D. C. Hamilton
- Department of Physics; University of Maryland; College Park Maryland USA
| | - N. Krupp
- Max Planck Institute for Solar System Research; Katlenburg-Lindau Germany
| | - M. K. Dougherty
- Space and Atmospheric Physics Group, Blackett Laboratory; Imperial College London; London UK
| | - A. J. Coates
- Mullard Space Science Laboratory, Department of Space and Climate Physics; University College London; London UK
- Centre for Planetary Sciences at UCL/Birkbeck; London UK
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Liu X, Hill TW, Wolf RA, Sazykin S, Spiro RW, Wu H. Numerical simulation of plasma transport in Saturn's inner magnetosphere using the Rice Convection Model. ACTA ACUST UNITED AC 2010. [DOI: 10.1029/2010ja015859] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- X. Liu
- Physics and Astronomy Department; Rice University; Houston Texas USA
| | - T. W. Hill
- Physics and Astronomy Department; Rice University; Houston Texas USA
| | - R. A. Wolf
- Physics and Astronomy Department; Rice University; Houston Texas USA
| | - S. Sazykin
- Physics and Astronomy Department; Rice University; Houston Texas USA
| | - R. W. Spiro
- Physics and Astronomy Department; Rice University; Houston Texas USA
| | - H. Wu
- Shell International Exploration and Production; Houston Texas USA
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Thomsen MF, Reisenfeld DB, Delapp DM, Tokar RL, Young DT, Crary FJ, Sittler EC, McGraw MA, Williams JD. Survey of ion plasma parameters in Saturn's magnetosphere. ACTA ACUST UNITED AC 2010. [DOI: 10.1029/2010ja015267] [Citation(s) in RCA: 207] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- M. F. Thomsen
- Los Alamos National Laboratory; Los Alamos New Mexico USA
| | | | - D. M. Delapp
- Los Alamos National Laboratory; Los Alamos New Mexico USA
| | - R. L. Tokar
- Los Alamos National Laboratory; Los Alamos New Mexico USA
| | - D. T. Young
- Southwest Research Institute; San Antonio Texas USA
| | - F. J. Crary
- Southwest Research Institute; San Antonio Texas USA
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Chen Y, Hill TW, Rymer AM, Wilson RJ. Rate of radial transport of plasma in Saturn's inner magnetosphere. ACTA ACUST UNITED AC 2010. [DOI: 10.1029/2010ja015412] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Y. Chen
- Department of Physics and Astronomy; Rice University; Houston Texas USA
| | - T. W. Hill
- Department of Physics and Astronomy; Rice University; Houston Texas USA
| | - A. M. Rymer
- Johns Hopkins University Applied Physics Laboratory; Laurel Maryland USA
| | - R. J. Wilson
- Laboratory for Atmospheric and Space Physics; University of Colorado at Boulder; Boulder Colorado USA
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Persoon AM, Gurnett DA, Santolik O, Kurth WS, Faden JB, Groene JB, Lewis GR, Coates AJ, Wilson RJ, Tokar RL, Wahlund JE, Moncuquet M. A diffusive equilibrium model for the plasma density in Saturn's magnetosphere. ACTA ACUST UNITED AC 2009. [DOI: 10.1029/2008ja013912] [Citation(s) in RCA: 83] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- A. M. Persoon
- Department of Physics and Astronomy; University of Iowa; Iowa City Iowa USA
| | - D. A. Gurnett
- Department of Physics and Astronomy; University of Iowa; Iowa City Iowa USA
| | - O. Santolik
- Institute of Atmospheric Physics; Prague Czech Republic
- Faculty of Mathematics and Physics; Charles University; Prague Czech Republic
| | - W. S. Kurth
- Department of Physics and Astronomy; University of Iowa; Iowa City Iowa USA
| | - J. B. Faden
- Department of Physics and Astronomy; University of Iowa; Iowa City Iowa USA
| | - J. B. Groene
- Department of Physics and Astronomy; University of Iowa; Iowa City Iowa USA
| | - G. R. Lewis
- Mullard Space Science Laboratory; University College London; Dorking UK
| | - A. J. Coates
- Mullard Space Science Laboratory; University College London; Dorking UK
| | - R. J. Wilson
- Space and Atmospheric Science Group; Los Alamos National Laboratory; Los Alamos New Mexico USA
| | - R. L. Tokar
- Space and Atmospheric Science Group; Los Alamos National Laboratory; Los Alamos New Mexico USA
| | | | - M. Moncuquet
- Laboratoire d'Etudies Spatiales et Instrumentation en Astrophysique; Observatoire de Paris; Meudon France
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Wilson RJ, Tokar RL, Henderson MG, Hill TW, Thomsen MF, Pontius DH. Cassini plasma spectrometer thermal ion measurements in Saturn's inner magnetosphere. ACTA ACUST UNITED AC 2008. [DOI: 10.1029/2008ja013486] [Citation(s) in RCA: 114] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- R. J. Wilson
- Space and Atmospheric Sciences Group; Los Alamos National Laboratory; Los Alamos New Mexico USA
| | - R. L. Tokar
- Space and Atmospheric Sciences Group; Los Alamos National Laboratory; Los Alamos New Mexico USA
| | - M. G. Henderson
- Space and Atmospheric Sciences Group; Los Alamos National Laboratory; Los Alamos New Mexico USA
| | - T. W. Hill
- Department of Physics and Astronomy; Rice University; Houston Texas USA
| | - M. F. Thomsen
- Space and Atmospheric Sciences Group; Los Alamos National Laboratory; Los Alamos New Mexico USA
| | - D. H. Pontius
- Physics Department; Birmingham-Southern College; Birmingham Alabama USA
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Wu H, Hill TW, Wolf RA, Spiro RW. Numerical simulation of fine structure in the Io plasma torus produced by the centrifugal interchange instability. ACTA ACUST UNITED AC 2007. [DOI: 10.1029/2006ja012032] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- H. Wu
- Department of Physics and Astronomy; Rice University; Houston Texas USA
| | - T. W. Hill
- Department of Physics and Astronomy; Rice University; Houston Texas USA
| | - R. A. Wolf
- Department of Physics and Astronomy; Rice University; Houston Texas USA
| | - R. W. Spiro
- Department of Physics and Astronomy; Rice University; Houston Texas USA
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Xin L, Gurnett DA, Santolík O, Kurth WS, Hospodarsky GB. Whistler-mode auroral hiss emissions observed near Saturn's B ring. ACTA ACUST UNITED AC 2006. [DOI: 10.1029/2005ja011432] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Hill TW. Effect of the acceleration current on the centrifugal interchange instability. ACTA ACUST UNITED AC 2006. [DOI: 10.1029/2005ja011338] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Frank LA, Paterson WR. Survey of thermal ions in the Io plasma torus with the Galileo spacecraft. ACTA ACUST UNITED AC 2001. [DOI: 10.1029/2000ja000159] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Cramm R, Glassmeier KH, Stellmacher M, Othmer C. Evidence for resonant mode coupling in Saturn's magnetosphere. ACTA ACUST UNITED AC 1998. [DOI: 10.1029/98ja00629] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Schneider NM, Taylor MH, Crary FJ, Trauger JT. On the nature of the λIIIbrightness asymmetry in the Io torus. ACTA ACUST UNITED AC 1997. [DOI: 10.1029/97ja00773] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Mei Y, Thorne RM, Bagenal F. Analytical model for the density distribution in the Io plasma torus. ACTA ACUST UNITED AC 1995. [DOI: 10.1029/94ja02359] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Barbosa DD. Thermal structure of ions and electrons in Saturn's inner magnetosphere. ACTA ACUST UNITED AC 1993. [DOI: 10.1029/93ja00478] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Huang TS, Birmingham TJ. The polarization electric field and its effects in an anisotropic rotating magnetospheric plasma. ACTA ACUST UNITED AC 1992. [DOI: 10.1029/91ja02611] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Zhang M, Richardson JD, Sittler EC. Voyager 2 electron observations in the magnetosphere of Neptune. ACTA ACUST UNITED AC 1991. [DOI: 10.1029/91ja01857] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Pontius DH, Hill TW. Rotation driven plasma transport: The coupling of macroscopic motion and microdiffusion. ACTA ACUST UNITED AC 1989. [DOI: 10.1029/ja094ia11p15041] [Citation(s) in RCA: 52] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Barbosa DD, Moreno MA. A comprehensive model of ion diffusion and charge exchange in the cold io torus. ACTA ACUST UNITED AC 1988. [DOI: 10.1029/ja093ia02p00823] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Abstract
Much has been learned about the electromagnetic interaction between Jupiter and its satellite Io from in situ observations. Io, in its motion through the Io plasma torus at Jupiter, continuously generates an Alfvén wing that carries two billion kilowatts of power into the jovian ionosphere. Concurrently, Io is acted upon by a J x B force tending to propel it out of the jovian system. The energy source for these processes is the rotation of Jupiter. This unusual planet-satellite coupling serves as an archetype for the interaction of a large moving conductor with a magnetized plasma, a problem of general space and astrophysical interest.
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Abstract
Voyager 1 carried a diverse collection of magnetospheric probes through the inner Jovian magnetosphere in March 1979. The ensuing data analysis and theoretical investigation provided a comprehensive description of the Jovian nebula, a luminous torus populated with newly released heavy ions drawn from Io's surface. Recent refinements in Earth-based imaging instrumentation are used to extend the Voyager in situ picture in temporal and spatial coverage. An analysis of [SIII] and [SII] optical emissions observed during the Jovian apparitions of 1981 through 1983 reveals three distinct torus components. Regularities have been identified in the ion partitioning and ion densities in the hot outer and inner tori, sharply defined radial structure is found in the plasma near Io, and the relative permanence of the cool inner torus is inferred. An extended cloud of neutral material is required as a source of fresh ions in the nebula.
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Lazarus AJ, Hasegawa T, Bagenal F. Long-lived particulate or gaseous structure in Saturn's outer magnetosphere? Nature 1983. [DOI: 10.1038/302230a0] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Abstract
Voyager 1 plasma flow data are compared with a recent theory that predicted measurable departures from rigid corotation in Jupiter's magnetosphere as a consequence of rapid plasma production and weak atmosphere-magnetosphere coupling. The comparison indicates that the theory can account for the observed corotation lag, provided that the plasma mass production rate during the Voyager 1 encounter was rather larger than expected, namely approximately 10(30) atomic mass units per second.
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Abstract
Images of the ring of singly ionized sulfur encircling Jupiter obtained on two successive nights in April 1979 show that the ring characteristics may change dramatically in approximately 24 hours. On the first night the ring was narrow and confined to the magnetic equator inside Io's orbit. On the second it was confined symmetrically about the centrifugal symmetry surface and showed considerable radial structure, including a "fan" extending to Io's orbit. Many of the differences in the ring on the two nights can be explained in terms of differences in sulfur plasma temperature.
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Cummings W, Dessler A, Hill T. Latitudinal oscillations of plasma within the Io torus. ACTA ACUST UNITED AC 1980. [DOI: 10.1029/ja085ia05p02108] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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