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Galand M, Moore L, Mueller-Wodarg I, Mendillo M, Miller S. Response of Saturn's auroral ionosphere to electron precipitation: Electron density, electron temperature, and electrical conductivity. ACTA ACUST UNITED AC 2011. [DOI: 10.1029/2010ja016412] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Marina Galand
- Space and Atmospheric Physics Group, Department of Physics; Imperial College London; London UK
- Center for Space Physics; Boston University; Boston Massachusetts USA
| | - Luke Moore
- Center for Space Physics; Boston University; Boston Massachusetts USA
| | - Ingo Mueller-Wodarg
- Space and Atmospheric Physics Group, Department of Physics; Imperial College London; London UK
- Center for Space Physics; Boston University; Boston Massachusetts USA
| | - Michael Mendillo
- Center for Space Physics; Boston University; Boston Massachusetts USA
| | - Steve Miller
- Atmospheric Physics Laboratory, Department of Physics and Astronomy; University College London; London UK
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Galand M, Moore L, Charnay B, Mueller-Wodarg I, Mendillo M. Solar primary and secondary ionization at Saturn. ACTA ACUST UNITED AC 2009. [DOI: 10.1029/2008ja013981] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Marina Galand
- Department of Physics; Imperial College London; London UK
| | - Luke Moore
- Center for Space Physics; Boston University; Boston Massachusetts USA
| | | | | | - Michael Mendillo
- Center for Space Physics; Boston University; Boston Massachusetts USA
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Phelps AV. Energetic ion, atom, and molecule reactions and excitation in low-current H2 discharges: model. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2009; 79:066401. [PMID: 19658606 DOI: 10.1103/physreve.79.066401] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/04/2009] [Indexed: 05/28/2023]
Abstract
Models of the elastic, inelastic, and reactive collisions of energetic hydrogen ions, atoms, and molecules are developed for predicting H_{alpha} and H2 near-uv emission, H_{alpha} Doppler profiles, and ion energy distributions for low-pressure, low-current discharges in H2 . The model is applied to spatially uniform electric field E to gas density N ratios of 350 Td< or =E/N< or =45 kTd and 8 x10;{19}< or =Nd< or =10 x10;{21} m;{-2} , where d is the electrode separation and 1 Td=10;{-21} V m;{2} . Mean ion energies at the cathode are 5-1500 eV. Cross sections for H+ , H2+ , H3+ , H, H2 , and excited H(n=3) collisions with H2 and reflection probabilities from electrodes are updated and summarized. Spatial and energy distributions of ions and fast neutrals are calculated using a "multibeam" technique. At the lower E/N and Nd , electron excitation of H_{alpha} dominates near the anode. Excitation of H_{alpha} by fast H atoms near the cathode increases rapidly with pressure through a multistep reaction sequence. At higher E/N , fast H atoms produced at the cathode surface excite much of the H_{alpha} . The model agrees with experimental spatial distributions of H_{alpha} emission and Doppler profiles. Ion energy distributions agree with experiments only for H2+ . Cross sections are derived for excitation of the near-uv continuum of H2 by H atoms.
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Affiliation(s)
- A V Phelps
- University of Colorado, Boulder, Colorado 80309-0440, USA
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Cowley SWH, Alexeev II, Belenkaya ES, Bunce EJ, Cottis CE, Kalegaev VV, Nichols JD, Prangé R, Wilson FJ. A simple axisymmetric model of magnetosphere-ionosphere coupling currents in Jupiter's polar ionosphere. ACTA ACUST UNITED AC 2005. [DOI: 10.1029/2005ja011237] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Kunde VG, Flasar FM, Jennings DE, Bézard B, Strobel DF, Conrath BJ, Nixon CA, Bjoraker GL, Romani PN, Achterberg RK, Simon-Miller AA, Irwin P, Brasunas JC, Pearl JC, Smith MD, Orton GS, Gierasch PJ, Spilker LJ, Carlson RC, Mamoutkine AA, Calcutt SB, Read PL, Taylor FW, Fouchet T, Parrish P, Barucci A, Courtin R, Coustenis A, Gautier D, Lellouch E, Marten A, Prangé R, Biraud Y, Ferrari C, Owen TC, Abbas MM, Samuelson RE, Raulin F, Ade P, Césarsky CJ, Grossman KU, Coradini A. Jupiter's Atmospheric Composition from the Cassini Thermal Infrared Spectroscopy Experiment. Science 2004; 305:1582-6. [PMID: 15319491 DOI: 10.1126/science.1100240] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
The Composite Infrared Spectrometer observed Jupiter in the thermal infrared during the swing-by of the Cassini spacecraft. Results include the detection of two new stratospheric species, the methyl radical and diacetylene, gaseous species present in the north and south auroral infrared hot spots; determination of the variations with latitude of acetylene and ethane, the latter a tracer of atmospheric motion; observations of unexpected spatial distributions of carbon dioxide and hydrogen cyanide, both considered to be products of comet Shoemaker-Levy 9 impacts; characterization of the morphology of the auroral infrared hot spot acetylene emission; and a new evaluation of the energetics of the northern auroral infrared hot spot.
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Affiliation(s)
- V G Kunde
- Department of Astronomy, University of Maryland, College Park, MD 20742, USA.
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Cowley SWH. A simple quantitative model of plasma flows and currents in Saturn's polar ionosphere. ACTA ACUST UNITED AC 2004. [DOI: 10.1029/2003ja010375] [Citation(s) in RCA: 113] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Cravens TE. Implications of Jovian X-ray emission for magnetosphere-ionosphere coupling. ACTA ACUST UNITED AC 2003. [DOI: 10.1029/2003ja010050] [Citation(s) in RCA: 81] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Frank LA, Paterson WR. Galileo observations of electron beams and thermal ions in Jupiter's magnetosphere and their relationship to the auroras. ACTA ACUST UNITED AC 2002. [DOI: 10.1029/2001ja009150] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- L. A. Frank
- Department of Physics and Astronomy; University of Iowa; Iowa City Iowa USA
| | - W. R. Paterson
- Department of Physics and Astronomy; University of Iowa; Iowa City Iowa USA
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Galand M, Chakrabarti S. Auroral processes in the solar system. ATMOSPHERES IN THE SOLAR SYSTEM: COMPARATIVE AERONOMY 2002. [DOI: 10.1029/130gm05] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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10
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Comparison of auroral processes: Earth and Jupiter. ACTA ACUST UNITED AC 2002. [DOI: 10.1029/130gm08] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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11
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Grodent D, Waite JH, Gérard JC. A self-consistent model of the Jovian auroral thermal structure. ACTA ACUST UNITED AC 2001. [DOI: 10.1029/2000ja900129] [Citation(s) in RCA: 143] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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12
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Frank LA, Paterson WR. Observations of plasmas in the Io torus with the Galileo spacecraft. ACTA ACUST UNITED AC 2000. [DOI: 10.1029/1999ja000250] [Citation(s) in RCA: 61] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Perry JJ, Kim YH, Fox JL, Porter HS. Chemistry of the Jovian auroral ionosphere. ACTA ACUST UNITED AC 1999. [DOI: 10.1029/1999je900022] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Rego D, Prangé R, Ben Jaffel L. Auroral Lyman α and H2bands from the giant planets: 3. Lyman α spectral profile including charge exchange and radiative transfer effects and H2color ratios. ACTA ACUST UNITED AC 1999. [DOI: 10.1029/1998je900048] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Prangé R, Rego D, Pallier L, Connerney JEP, Zarka P, Queinnec J. Detailed study of FUV Jovian auroral features with the post-COSTAR HST faint object camera. ACTA ACUST UNITED AC 1998. [DOI: 10.1029/98je01128] [Citation(s) in RCA: 88] [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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Achilleos N, Miller S, Tennyson J, Aylward AD, Mueller-Wodarg I, Rees D. JIM: A time-dependent, three-dimensional model of Jupiter's thermosphere and ionosphere. ACTA ACUST UNITED AC 1998. [DOI: 10.1029/98je00947] [Citation(s) in RCA: 92] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Pryor WR, Ajello JM, Tobiska WK, Shemansky DE, James GK, Hord CW, Stephens SK, West RA, Stewart AIF, McClintock WE, Simmons KE, Hendrix AR, Miller DA. Galileo ultraviolet spectrometer observations of Jupiter's auroral spectrum from 1600-3200 Å. ACTA ACUST UNITED AC 1998. [DOI: 10.1029/98je00787] [Citation(s) in RCA: 20] [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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18
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Bisikalo DV, Shematovich VI, Gérard JC, Gladstone GR, Waite JH. The distribution of hot hydrogen atoms produced by electron and proton precipitation in the Jovian aurora. ACTA ACUST UNITED AC 1996. [DOI: 10.1029/96je01952] [Citation(s) in RCA: 15] [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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Prangé R, Rego D, Southwood D, Zarka P, Miller S, Ip W. Rapid energy dissipation and variability of the lo–Jupiter electrodynamic circuit. Nature 1996. [DOI: 10.1038/379323a0] [Citation(s) in RCA: 96] [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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Prangé R, Rego D, Gérard JC. Auroral Lyman α and H2bands from the giant planets: 2. Effect of the anisotropy of the precipitating particles on the interpretation of the “color ratio”. ACTA ACUST UNITED AC 1995. [DOI: 10.1029/94je03176] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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21
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Gérard JC, Grodent D, Dols V, Prangé R, Waite JH, Gladstone GR, Franke KA, Paresce F, Storrs A, Jaffel LB. A Remarkable Auroral Event on Jupiter Observed in the Ultraviolet with the Hubble Space Telescope. Science 1994; 266:1675-8. [PMID: 17775626 DOI: 10.1126/science.266.5191.1675] [Citation(s) in RCA: 48] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Two sets of ultraviolet images of the Jovian north aurora were obtained with the Faint Object Camera on board the Hubble Space Telescope. The first series shows an intense discrete arc in near corotation with the planet. The maximum apparent molecular hydrogen emission rate corresponds to an electron precipitation of approximately 1 watt per square meter, which is about 30,000 times larger than the solar heating by extreme ultraviolet radiation. Such a particle heating rate of the auroral upper atmosphere of Jupiter should cause a large transient temperature increase and generate strong thermospheric winds. Twenty hours after initial observation, the discrete arc had decreased in brightness by more than one order of magnitude. The time scale and magnitude of the change in the ultraviolet aurora leads us to suggest that the discrete Jovian auroral precipitation is related to large-scale variations in the current system, as is the case for Earth's discrete aurorae.
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