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Jackman CM, Thomsen MF, Mitchell DG, Sergis N, Arridge CS, Felici M, Badman SV, Paranicas C, Jia X, Hospodarksy GB, Andriopoulou M, Khurana KK, Smith AW, Dougherty MK. Field dipolarization in Saturn's magnetotail with planetward ion flows and energetic particle flow bursts: Evidence of quasi-steady reconnection. JOURNAL OF GEOPHYSICAL RESEARCH. SPACE PHYSICS 2015; 120:3603-3617. [PMID: 27570722 PMCID: PMC4981121 DOI: 10.1002/2015ja020995] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/12/2015] [Revised: 04/01/2015] [Accepted: 04/01/2015] [Indexed: 05/20/2023]
Abstract
We present a case study of an event from 20 August (day 232) of 2006, when the Cassini spacecraft was sampling the region near 32 RS and 22 h LT in Saturn's magnetotail. Cassini observed a strong northward-to-southward turning of the magnetic field, which is interpreted as the signature of dipolarization of the field as seen by the spacecraft planetward of the reconnection X line. This event was accompanied by very rapid (up to ~1500 km s-1) thermal plasma flow toward the planet. At energies above 28 keV, energetic hydrogen and oxygen ion flow bursts were observed to stream planetward from a reconnection site downtail of the spacecraft. Meanwhile, a strong field-aligned beam of energetic hydrogen was also observed to stream tailward, likely from an ionospheric source. Saturn kilometric radiation emissions were stimulated shortly after the observation of the dipolarization. We discuss the field, plasma, energetic particle, and radio observations in the context of the impact this reconnection event had on global magnetospheric dynamics.
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Affiliation(s)
- C. M. Jackman
- School of Physics and AstronomyUniversity of SouthamptonSouthamptonUK
| | | | - D. G. Mitchell
- The Johns Hopkins University Applied Physics LaboratoryLaurelMarylandUSA
| | | | | | - M. Felici
- Department of PhysicsLancaster UniversityBailriggUK
- Mullard Space Science LaboratoryUniversity College LondonSurreyUK
- The Centre for Planetary Sciences at UCL/BirkbeckLondonUK
| | - S. V. Badman
- Department of PhysicsLancaster UniversityBailriggUK
| | - C. Paranicas
- The Johns Hopkins University Applied Physics LaboratoryLaurelMarylandUSA
| | - X. Jia
- Atmospheric, Oceanic and Space SciencesUniversity of MichiganAnn ArborMichiganUSA
| | - G. B. Hospodarksy
- Department of Physics and AstronomyUniversity of IowaIowa CityIowaUSA
| | - M. Andriopoulou
- Space Research InstituteAustrian Academy of SciencesGrazAustria
| | - K. K. Khurana
- Institute of Geophysics and Planetary PhysicsUniversity of CaliforniaLos AngelesCaliforniaUSA
| | - A. W. Smith
- School of Physics and AstronomyUniversity of SouthamptonSouthamptonUK
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Jasinski JM, Arridge CS, Lamy L, Leisner JS, Thomsen MF, Mitchell DG, Coates AJ, Radioti A, Jones GH, Roussos E, Krupp N, Grodent D, Dougherty MK, Waite JH. Cusp observation at Saturn's high-latitude magnetosphere by the Cassini spacecraft. GEOPHYSICAL RESEARCH LETTERS 2014; 41:1382-1388. [PMID: 25821276 PMCID: PMC4373149 DOI: 10.1002/2014gl059319] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/23/2014] [Accepted: 02/13/2014] [Indexed: 05/24/2023]
Abstract
UNLABELLED We report on the first analysis of magnetospheric cusp observations at Saturn by multiple in situ instruments onboard the Cassini spacecraft. Using this we infer the process of reconnection was occurring at Saturn's magnetopause. This agrees with remote observations that showed the associated auroral signatures of reconnection. Cassini crossed the northern cusp around noon local time along a poleward trajectory. The spacecraft observed ion energy-latitude dispersions-a characteristic signature of the terrestrial cusp. This ion dispersion is "stepped," which shows that the reconnection is pulsed. The ion energy-pitch angle dispersions suggest that the field-aligned distance from the cusp to the reconnection site varies between ∼27 and 51 RS . An intensification of lower frequencies of the Saturn kilometric radiation emissions suggests the prior arrival of a solar wind shock front, compressing the magnetosphere and providing more favorable conditions for magnetopause reconnection. KEY POINTS We observe evidence for reconnection in the cusp plasma at SaturnWe present evidence that the reconnection process can be pulsed at SaturnSaturn's cusp shows similar characteristics to the terrestrial cusp.
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Affiliation(s)
- J M Jasinski
- Mullard Space Science Laboratory, Department of Space and Climate Physics, University College London Dorking, Surrey, UK ; Centre for Planetary Sciences, UCL/Birkbeck London, UK
| | - C S Arridge
- Mullard Space Science Laboratory, Department of Space and Climate Physics, University College London Dorking, Surrey, UK ; Centre for Planetary Sciences, UCL/Birkbeck London, UK
| | - L Lamy
- LESIA, Observatoire de Paris, CNRS, UPMC, Université Paris 6, Université Paris Diderot Meudon, France
| | - J S Leisner
- Blackett Laboratory, Department of Physics, Imperial College London London, UK
| | - M F Thomsen
- Planetary Science Institute Tucson, Arizona, USA
| | - D G Mitchell
- Applied Physics Laboratory, Johns Hopkins University Laurel, Maryland, USA
| | - A J Coates
- Mullard Space Science Laboratory, Department of Space and Climate Physics, University College London Dorking, Surrey, UK ; Centre for Planetary Sciences, UCL/Birkbeck London, UK
| | - A Radioti
- Laboratoire de Physique Atmosphérique et Planétaire, Institut d'Astrophysique et de Géophysique, Université de Liége Liege, Belgium
| | - G H Jones
- Mullard Space Science Laboratory, Department of Space and Climate Physics, University College London Dorking, Surrey, UK ; Centre for Planetary Sciences, UCL/Birkbeck London, UK
| | - E Roussos
- Max-Planck-Institut für Sonnensystemforschung Göttingen, Germany
| | - N Krupp
- Max-Planck-Institut für Sonnensystemforschung Göttingen, Germany
| | - D Grodent
- Laboratoire de Physique Atmosphérique et Planétaire, Institut d'Astrophysique et de Géophysique, Université de Liége Liege, Belgium
| | | | - J H Waite
- Southwest Research Institute, Space Science and Engineering Division San Antonio, Texas, USA
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Meredith CJ, Alexeev II, Badman SV, Belenkaya ES, Cowley SWH, Dougherty MK, Kalegaev VV, Lewis GR, Nichols JD. Saturn's dayside ultraviolet auroras: Evidence for morphological dependence on the direction of the upstream interplanetary magnetic field. JOURNAL OF GEOPHYSICAL RESEARCH. SPACE PHYSICS 2014; 119:1994-2008. [PMID: 26167441 PMCID: PMC4497471 DOI: 10.1002/2013ja019598] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/05/2013] [Revised: 02/25/2014] [Accepted: 03/12/2014] [Indexed: 06/04/2023]
Abstract
UNLABELLED We examine a unique data set from seven Hubble Space Telescope (HST) "visits" that imaged Saturn's northern dayside ultraviolet emissions exhibiting usual circumpolar "auroral oval" morphologies, during which Cassini measured the interplanetary magnetic field (IMF) upstream of Saturn's bow shock over intervals of several hours. The auroras generally consist of a dawn arc extending toward noon centered near ∼15° colatitude, together with intermittent patchy forms at ∼10° colatitude and poleward thereof, located between noon and dusk. The dawn arc is a persistent feature, but exhibits variations in position, width, and intensity, which have no clear relationship with the concurrent IMF. However, the patchy postnoon auroras are found to relate to the (suitably lagged and averaged) IMF Bz , being present during all four visits with positive Bz and absent during all three visits with negative Bz . The most continuous such forms occur in the case of strongest positive Bz . These results suggest that the postnoon forms are associated with reconnection and open flux production at Saturn's magnetopause, related to the similarly interpreted bifurcated auroral arc structures previously observed in this local time sector in Cassini Ultraviolet Imaging Spectrograph data, whose details remain unresolved in these HST images. One of the intervals with negative IMF Bz however exhibits a prenoon patch of very high latitude emission extending poleward of the dawn arc to the magnetic/spin pole, suggestive of the occurrence of lobe reconnection. Overall, these data provide evidence of significant IMF dependence in the morphology of Saturn's dayside auroras. KEY POINTS We examine seven cases of joint HST Saturn auroral images and Cassini IMF dataThe persistent but variable dawn arc shows no obvious IMF dependencePatchy postnoon auroras are present for northward IMF but not for southward IMF.
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Affiliation(s)
- C J Meredith
- Department of Physics and Astronomy, University of Leicester Leicester, UK
| | - I I Alexeev
- Lomonosov Moscow State University, Skobeltsyn Institute of Nuclear Physics Moscow, Russian Federation
| | - S V Badman
- Department of Physics and Astronomy, University of Leicester Leicester, UK ; Department of Physics, University of Lancaster Lancaster, UK
| | - E S Belenkaya
- Lomonosov Moscow State University, Skobeltsyn Institute of Nuclear Physics Moscow, Russian Federation
| | - S W H Cowley
- Department of Physics and Astronomy, University of Leicester Leicester, UK
| | - M K Dougherty
- Blackett Laboratory, Imperial College London London, UK
| | - V V Kalegaev
- Lomonosov Moscow State University, Skobeltsyn Institute of Nuclear Physics Moscow, Russian Federation
| | - G R Lewis
- Mullard Space Science Laboratory, University College London Dorking, UK
| | - J D Nichols
- Department of Physics and Astronomy, University of Leicester Leicester, UK
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Jia X, Hansen KC, Gombosi TI, Kivelson MG, Tóth G, DeZeeuw DL, Ridley AJ. Magnetospheric configuration and dynamics of Saturn's magnetosphere: A global MHD simulation. ACTA ACUST UNITED AC 2012. [DOI: 10.1029/2012ja017575] [Citation(s) in RCA: 92] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Badman SV, Achilleos N, Arridge CS, Baines KH, Brown RH, Bunce EJ, Coates AJ, Cowley SWH, Dougherty MK, Fujimoto M, Hospodarsky G, Kasahara S, Kimura T, Melin H, Mitchell DG, Stallard T, Tao C. Cassini observations of ion and electron beams at Saturn and their relationship to infrared auroral arcs. ACTA ACUST UNITED AC 2012. [DOI: 10.1029/2011ja017222] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Radioti A, Grodent D, Gérard JC, Milan SE, Bonfond B, Gustin J, Pryor W. Bifurcations of the main auroral ring at Saturn: ionospheric signatures of consecutive reconnection events at the magnetopause. ACTA ACUST UNITED AC 2011. [DOI: 10.1029/2011ja016661] [Citation(s) in RCA: 66] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- A. Radioti
- Laboratoire de Physique Atmosphérique et Planétaire, Institut d'Astrophysique et de Géophysique; Université de Liège; Liège Belgium
| | - D. Grodent
- Laboratoire de Physique Atmosphérique et Planétaire, Institut d'Astrophysique et de Géophysique; Université de Liège; Liège Belgium
| | - J.-C. Gérard
- Laboratoire de Physique Atmosphérique et Planétaire, Institut d'Astrophysique et de Géophysique; Université de Liège; Liège Belgium
| | - S. E. Milan
- Department of Physics and Astronomy; University of Leicester; Leicester U. K
| | - B. Bonfond
- Laboratoire de Physique Atmosphérique et Planétaire, Institut d'Astrophysique et de Géophysique; Université de Liège; Liège Belgium
| | - J. Gustin
- Laboratoire de Physique Atmosphérique et Planétaire, Institut d'Astrophysique et de Géophysique; Université de Liège; Liège Belgium
| | - W. Pryor
- Science Department; Central Arizona College; Coolidge Arizona USA
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Jackman CM, Slavin JA, Cowley SWH. Cassini observations of plasmoid structure and dynamics: Implications for the role of magnetic reconnection in magnetospheric circulation at Saturn. ACTA ACUST UNITED AC 2011. [DOI: 10.1029/2011ja016682] [Citation(s) in RCA: 66] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- C. M. Jackman
- Department of Physics and Astronomy; University College London; London UK
| | - J. A. Slavin
- NASA Goddard Space Flight Center; Greenbelt Maryland USA
| | - S. W. H. Cowley
- Department of Physics and Astronomy; University of Leicester; Leicester UK
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Hsu HW, Postberg F, Kempf S, Trieloff M, Burton M, Roy M, Moragas-Klostermeyer G, Srama R. Stream particles as the probe of the dust-plasma-magnetosphere interaction at Saturn. ACTA ACUST UNITED AC 2011. [DOI: 10.1029/2011ja016488] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- H.-W. Hsu
- MPI für Kernphysik; Heidelberg Germany
- Institut für Geowissenschaften; Ruprecht-Karls Universität; Heidelberg Germany
- Laboratory for Atmospheric and Space Physics; University of Colorado; Boulder Colorado USA
| | - F. Postberg
- MPI für Kernphysik; Heidelberg Germany
- Institut für Geowissenschaften; Ruprecht-Karls Universität; Heidelberg Germany
| | - S. Kempf
- MPI für Kernphysik; Heidelberg Germany
- Laboratory for Atmospheric and Space Physics; University of Colorado; Boulder Colorado USA
- Institut für Geophysik und Extraterrestrische Physik; Universität Braunschweig; Braunschweig Germany
| | - M. Trieloff
- Institut für Geowissenschaften; Ruprecht-Karls Universität; Heidelberg Germany
| | - M. Burton
- Jet Propulsion Laboratory; Pasadena California USA
| | - M. Roy
- Jet Propulsion Laboratory; Pasadena California USA
| | - G. Moragas-Klostermeyer
- MPI für Kernphysik; Heidelberg Germany
- Laboratory for Atmospheric and Space Physics; University of Colorado; Boulder Colorado USA
| | - R. Srama
- MPI für Kernphysik; Heidelberg Germany
- Institut für Raumfahrtsysteme; Universität Stuttgart; Stuttgart Germany
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Hsu HW, Kempf S, Postberg F, Trieloff M, Burton M, Roy M, Moragas-Klostermeyer G, Srama R. Cassini dust stream particle measurements during the first three orbits at Saturn. ACTA ACUST UNITED AC 2011. [DOI: 10.1029/2010ja015959] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- H.-W. Hsu
- Max-Planck-Institut für Kernphysik; Heidelberg Germany
- Institut für Geowissenschaften; Ruprecht-Karls-Universität; Heidelberg Germany
- Laboratory for Atmospheric and Space Physics; University of Colorado at Boulder; Boulder Colorado USA
| | - S. Kempf
- Max-Planck-Institut für Kernphysik; Heidelberg Germany
- Institut für Geophysik und Extraterrestrische Physik; Universität Braunschweig; Braunschweig Germany
| | - F. Postberg
- Max-Planck-Institut für Kernphysik; Heidelberg Germany
- Institut für Geowissenschaften; Ruprecht-Karls-Universität; Heidelberg Germany
| | - M. Trieloff
- Institut für Geowissenschaften; Ruprecht-Karls-Universität; Heidelberg Germany
| | - M. Burton
- Jet Propulsion Laboratory; Pasadena California USA
| | - M. Roy
- Jet Propulsion Laboratory; Pasadena California USA
| | - G. Moragas-Klostermeyer
- Max-Planck-Institut für Kernphysik; Heidelberg Germany
- Laboratory for Atmospheric and Space Physics; University of Colorado at Boulder; Boulder Colorado USA
| | - R. Srama
- Max-Planck-Institut für Kernphysik; Heidelberg Germany
- Institut für Raumfahrtsysteme; Universität Stuttgart; Stuttgart Germany
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Jackman CM, Arridge CS, Slavin JA, Milan SE, Lamy L, Dougherty MK, Coates AJ. In situ observations of the effect of a solar wind compression on Saturn's magnetotail. ACTA ACUST UNITED AC 2010. [DOI: 10.1029/2010ja015312] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- C. M. Jackman
- Blackett Laboratory; Imperial College London; London UK
| | - C. S. Arridge
- Mullard Space Science Laboratory, Department of Space and Climate Physics; University College London; Dorking UK
- The Centre for Planetary Sciences at UCL/Birkbeck; London UK
| | - J. A. Slavin
- Heliophysics Science Division; NASA Goddard Space Flight Center; Greenbelt Maryland USA
| | - S. E. Milan
- Radio and Space Plasma Physics Group; University of Leicester; Leicester UK
| | - L. Lamy
- Blackett Laboratory; Imperial College London; London UK
| | | | - A. J. Coates
- Mullard Space Science Laboratory, Department of Space and Climate Physics; University College London; Dorking UK
- The Centre for Planetary Sciences at UCL/Birkbeck; London UK
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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: 2.9] [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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Grocott A, Badman SV, Cowley SWH, Milan SE, Nichols JD, Yeoman TK. Magnetosonic Mach number dependence of the efficiency of reconnection between planetary and interplanetary magnetic fields. ACTA ACUST UNITED AC 2009. [DOI: 10.1029/2009ja014330] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- A. Grocott
- Department of Physics and Astronomy; University of Leicester; Leicester UK
| | - S. V. Badman
- Department of Physics and Astronomy; University of Leicester; Leicester UK
| | - S. W. H. Cowley
- Department of Physics and Astronomy; University of Leicester; Leicester UK
| | - S. E. Milan
- Department of Physics and Astronomy; University of Leicester; Leicester UK
| | - J. D. Nichols
- Department of Physics and Astronomy; University of Leicester; Leicester UK
| | - T. K. Yeoman
- Department of Physics and Astronomy; University of Leicester; Leicester UK
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Jackman CM, Arridge CS, Krupp N, Bunce EJ, Mitchell DG, McAndrews HJ, Dougherty MK, Russell CT, Achilleos N, Jones GH, Coates AJ. A multi-instrument view of tail reconnection at Saturn. ACTA ACUST UNITED AC 2008. [DOI: 10.1029/2008ja013592] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- C. M. Jackman
- Space and Atmospheric Physics Group; Imperial College London; London UK
| | - C. S. Arridge
- Mullard Space Science Laboratory; University College London; Surrey UK
- Centre for Planetary Sciences; University College London; London UK
| | - N. Krupp
- Max Planck Institute for Solar System Research; Katlenburg-Lindau Germany
| | - E. J. Bunce
- Department of Physics and Astronomy; University of Leicester; Leicester UK
| | - D. G. Mitchell
- Applied Physics Laboratory; Johns Hopkins University; Baltimore Maryland USA
| | | | - M. K. Dougherty
- Space and Atmospheric Physics Group; Imperial College London; London UK
| | - C. T. Russell
- Institute of Geophysics and Planetary Physics; University of California; Los Angeles California USA
| | - N. Achilleos
- Centre for Planetary Sciences; University College London; London UK
- Department of Physics and Astronomy; University College London; London UK
| | - G. H. Jones
- Mullard Space Science Laboratory; University College London; Surrey UK
- Centre for Planetary Sciences; University College London; London UK
| | - A. J. Coates
- Mullard Space Science Laboratory; University College London; Surrey UK
- Centre for Planetary Sciences; University College London; London UK
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Achilleos N, Arridge CS, Bertucci C, Jackman CM, Dougherty MK, Khurana KK, Russell CT. Large-scale dynamics of Saturn's magnetopause: Observations by Cassini. ACTA ACUST UNITED AC 2008. [DOI: 10.1029/2008ja013265] [Citation(s) in RCA: 83] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- N. Achilleos
- Atmospheric Physics Laboratory, Center for Planetary Sciences; University College London; London UK
- Blackett Laboratory; Imperial College London; London UK
| | - C. S. Arridge
- Blackett Laboratory; Imperial College London; London UK
- Mullard Space Science Laboratory, Center for Planetary Sciences; University College London, Holmbury St Mary; London UK
| | - C. Bertucci
- Blackett Laboratory; Imperial College London; London UK
| | - C. M. Jackman
- Blackett Laboratory; Imperial College London; London UK
| | | | - K. K. Khurana
- Institute of Geophysics and Planetary Physics; University of California-Los Angeles; Los Angeles California USA
| | - C. T. Russell
- Institute of Geophysics and Planetary Physics; University of California-Los Angeles; Los Angeles California USA
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Masters A, Achilleos N, Dougherty MK, Slavin JA, Hospodarsky GB, Arridge CS, Coates AJ. An empirical model of Saturn's bow shock: Cassini observations of shock location and shape. ACTA ACUST UNITED AC 2008. [DOI: 10.1029/2008ja013276] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- A. Masters
- Space and Atmospheric Physics Group, The Blackett Laboratory; Imperial College London; London UK
| | - N. Achilleos
- Atmospheric Physics Laboratory, Department of Physics and Astronomy; University College London; London UK
| | - M. K. Dougherty
- Space and Atmospheric Physics Group, The Blackett Laboratory; Imperial College London; London UK
| | - J. A. Slavin
- Heliophysics Science Division; NASA GSFC; Greenbelt Maryland USA
| | - G. B. Hospodarsky
- Department of Physics and Astronomy; University of Iowa; Iowa City Iowa USA
| | - C. S. Arridge
- Mullard Space Science Laboratory, Department of Space and Climate Physics; University College London; Dorking UK
- Centre for Planetary Sciences; University College London; London UK
| | - A. J. Coates
- Mullard Space Science Laboratory, Department of Space and Climate Physics; University College London; Dorking UK
- Centre for Planetary Sciences; University College London; London UK
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Jackman CM, Forsyth RJ, Dougherty MK. The overall configuration of the interplanetary magnetic field upstream of Saturn as revealed by Cassini observations. ACTA ACUST UNITED AC 2008. [DOI: 10.1029/2008ja013083] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- C. M. Jackman
- Space and Atmospheric Physics, Blackett Laboratory; Imperial College London; London UK
| | - R. J. Forsyth
- Space and Atmospheric Physics, Blackett Laboratory; Imperial College London; London UK
| | - M. K. Dougherty
- Space and Atmospheric Physics, Blackett Laboratory; Imperial College London; London UK
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Arridge CS, Khurana KK, Russell CT, Southwood DJ, Achilleos N, Dougherty MK, Coates AJ, Leinweber HK. Warping of Saturn's magnetospheric and magnetotail current sheets. ACTA ACUST UNITED AC 2008. [DOI: 10.1029/2007ja012963] [Citation(s) in RCA: 126] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- C. S. Arridge
- Mullard Space Science Laboratory; University College London; Dorking UK
- Centre for Planetary Sciences; University College London; London UK
- Space and Atmospheric Physics Group; Blackett Laboratory, Imperial College London; London UK
| | - K. K. Khurana
- Institute of Geophysics and Planetary Physics; University of California; Los Angeles California USA
| | - C. T. Russell
- Institute of Geophysics and Planetary Physics; University of California; Los Angeles California USA
| | - D. J. Southwood
- Institute of Geophysics and Planetary Physics; University of California; Los Angeles California USA
- European Space Agency; Paris France
| | - N. Achilleos
- Space and Atmospheric Physics Group; Blackett Laboratory, Imperial College London; London UK
- Atmospheric Physics Laboratory; University College London; London UK
| | - M. K. Dougherty
- Space and Atmospheric Physics Group; Blackett Laboratory, Imperial College London; London UK
| | - A. J. Coates
- Mullard Space Science Laboratory; University College London; Dorking UK
- Centre for Planetary Sciences; University College London; London UK
| | - H. K. Leinweber
- Institute of Geophysics and Planetary Physics; University of California; Los Angeles California USA
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McAndrews HJ, Owen CJ, Thomsen MF, Lavraud B, Coates AJ, Dougherty MK, Young DT. Evidence for reconnection at Saturn's magnetopause. ACTA ACUST UNITED AC 2008. [DOI: 10.1029/2007ja012581] [Citation(s) in RCA: 91] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- H. J. McAndrews
- Los Alamos National Laboratory; Los Alamos New Mexico USA
- Mullard Space Science Laboratory; University College London; Surrey UK
| | - C. J. Owen
- Mullard Space Science Laboratory; University College London; Surrey UK
| | - M. F. Thomsen
- Los Alamos National Laboratory; Los Alamos New Mexico USA
| | - B. Lavraud
- Los Alamos National Laboratory; Los Alamos New Mexico USA
| | - A. J. Coates
- Mullard Space Science Laboratory; University College London; Surrey UK
| | - M. K. Dougherty
- Space and Atmospheric Physics Group; Blackett Laboratory, Imperial College; London UK
| | - D. T. Young
- Division of Space Science and Engineering; Southwest Research Institute; San Antonio Texas USA
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Glocer A, Gombosi TI, Toth G, Hansen KC, Ridley AJ, Nagy A. Polar wind outflow model: Saturn results. ACTA ACUST UNITED AC 2007. [DOI: 10.1029/2006ja011755] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
- A. Glocer
- Center for Space Environment Modeling; University of Michigan; Ann Arbor Michigan USA
| | - T. I. Gombosi
- Center for Space Environment Modeling; University of Michigan; Ann Arbor Michigan USA
| | - G. Toth
- Center for Space Environment Modeling; University of Michigan; Ann Arbor Michigan USA
| | - K. C. Hansen
- Center for Space Environment Modeling; University of Michigan; Ann Arbor Michigan USA
| | - A. J. Ridley
- Center for Space Environment Modeling; University of Michigan; Ann Arbor Michigan USA
| | - A. Nagy
- Center for Space Environment Modeling; University of Michigan; Ann Arbor Michigan USA
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Arridge CS, Achilleos N, Dougherty MK, Khurana KK, Russell CT. Modeling the size and shape of Saturn's magnetopause with variable dynamic pressure. ACTA ACUST UNITED AC 2006. [DOI: 10.1029/2005ja011574] [Citation(s) in RCA: 127] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Lario D, Decker RB, Livi S, Krimigis SM, Roelof EC, Russell CT, Fry CD. Heliospheric energetic particle observations during the October-November 2003 events. ACTA ACUST UNITED AC 2005. [DOI: 10.1029/2004ja010940] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- D. Lario
- Johns Hopkins University Applied Physics Laboratory; Laurel Maryland USA
| | - R. B. Decker
- Johns Hopkins University Applied Physics Laboratory; Laurel Maryland USA
| | - S. Livi
- Johns Hopkins University Applied Physics Laboratory; Laurel Maryland USA
| | - S. M. Krimigis
- Johns Hopkins University Applied Physics Laboratory; Laurel Maryland USA
| | - E. C. Roelof
- Johns Hopkins University Applied Physics Laboratory; Laurel Maryland USA
| | - C. T. Russell
- Department of Earth and Space Sciences, Institute of Geophysics and Planetary Physics; University of California; Los Angeles California USA
| | - C. D. Fry
- Exploration Physics International, Inc.; Huntsville Alabama USA
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Dougherty MK, Achilleos N, Andre N, Arridge CS, Balogh A, Bertucci C, Burton ME, Cowley SWH, Erdos G, Giampieri G, Glassmeier KH, Khurana KK, Leisner J, Neubauer FM, Russell CT, Smith EJ, Southwood DJ, Tsurutani BT. Cassini Magnetometer Observations During Saturn Orbit Insertion. Science 2005; 307:1266-70. [PMID: 15731444 DOI: 10.1126/science.1106098] [Citation(s) in RCA: 195] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
Cassini's successful orbit insertion has provided the first examination of Saturn's magnetosphere in 23 years, revealing a dynamic plasma and magnetic environment on short and long time scales. There has been no noticeable change in the internal magnetic field, either in its strength or its near-alignment with the rotation axis. However, the external magnetic field is different compared with past spacecraft observations. The current sheet within the magnetosphere is thinner and more extended, and we observed small diamagnetic cavities and ion cyclotron waves of types that were not reported before.
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Affiliation(s)
- M K Dougherty
- Blackett Laboratory, Imperial College London, SW7 2AZ, UK.
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Badman SV, Bunce EJ, Clarke JT, Cowley SWH, Gérard JC, Grodent D, Milan SE. Open flux estimates in Saturn's magnetosphere during the January 2004 Cassini-HST campaign, and implications for reconnection rates. ACTA ACUST UNITED AC 2005. [DOI: 10.1029/2005ja011240] [Citation(s) in RCA: 86] [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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Cowley SWH. Reconnection in a rotation-dominated magnetosphere and its relation to Saturn's auroral dynamics. ACTA ACUST UNITED AC 2005. [DOI: 10.1029/2004ja010796] [Citation(s) in RCA: 132] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Gérard JC, Bunce EJ, Grodent D, Cowley SWH, Clarke JT, Badman SV. Signature of Saturn's auroral cusp: Simultaneous Hubble Space Telescope FUV observations and upstream solar wind monitoring. ACTA ACUST UNITED AC 2005. [DOI: 10.1029/2005ja011094] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Jackman CM. Interplanetary conditions and magnetospheric dynamics during the Cassini orbit insertion fly-through of Saturn's magnetosphere. ACTA ACUST UNITED AC 2005. [DOI: 10.1029/2005ja011054] [Citation(s) in RCA: 28] [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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Milan SE. Implications of rapid planetary rotation for the Dungey magnetotail of Saturn. ACTA ACUST UNITED AC 2005. [DOI: 10.1029/2004ja010716] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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