Plasma conditions at Europa’s orbit

Abstract With attention turned to Europa as a target for exploration, we focus on the space environment in which Europa is embedded. We review remote and in situ observations of plasma properties at Europa’s orbit, between Io’s dense, UV-emitting plasma torus and Jupiter’s dynamic plasma sheet. Where observations are limited (e.g. in plasma composition), we supplement our analysis with models of the neutral and plasma populations from Io to Europa. We evaluate variations and uncertainties in plasma properties with radial distance, latitude, longitude and time.

[1]  D. Shemansky,et al.  A comparison of the Voyager 1 ultraviolet spectrometer and plasma science measurements of the Io plasma torus , 1995 .

[2]  W. Paterson,et al.  Return to Io by the Galileo spacecraft: Plasma observations , 2000 .

[3]  D. Strobel,et al.  Overview of the Voyager ultraviolet spectrometry results through Jupiter encounter , 1981 .

[4]  W. Paterson,et al.  Intense electron beams observed at Io with the Galileo spacecraft , 1999 .

[5]  W. Paterson,et al.  Passage through lo's ionospheric plasmas by the Galileo spacecraft , 2001 .

[6]  D. Strobel,et al.  Io plasma torus electrons: Voyager 1 , 1987 .

[7]  F. Leblanc,et al.  Composition and Detection of Europa's Sputter-Induced Atmosphere , 2007 .

[8]  J. Blamont,et al.  Extreme Ultraviolet Observations from Voyager 1 Encounter with Jupiter , 1979, Science.

[9]  H. Ferguson,et al.  Determination of ionic abundances in the Io torus using the Hopkins Ultraviolet Telescope , 1991 .

[10]  M. Moncuquet,et al.  Electron density and temperature in the Io plasma torus from Ulysses thermal noise measurements , 1993 .

[11]  R. E. Johnson,et al.  The ion environment near Europa and its role in surface energetics , 2002 .

[12]  D. Shemansky,et al.  The Voyager 1 EUV spectrum of the Io plasma torus , 1981 .

[13]  P. Zarka,et al.  Source characteristics of Jovian narrow‐band kilometric radio emissions , 1993 .

[14]  G. Ballester,et al.  Extreme Ultraviolet Explorer spectra of the Io plasma torus: Improved spectral resolution and new results , 2001 .

[15]  D. Shemansky.  Energy branching in the Io plasma torus: The failure of neutral cloud theory , 1988 .

[16]  Donald A. Gurnett,et al.  A study of the large‐scale dynamics of the Jovian magnetosphere using the Galileo Plasma Wave Experiment , 1998 .

[17]  W. Paterson,et al.  Plasmas observed near local noon in Jupiter's magnetosphere with the Galileo spacecraft , 2004 .

[18]  R. S. Wolff,et al.  Plasma Observations Near Uranus: Initial Results from Voyager 2 , 1979, Science.

[19]  Fritz M. Neubauer,et al.  Interaction of the Jovian magnetosphere with Europa: Constraints on the neutral atmosphere , 1998 .

[20]  Peter A. Delamere,et al.  Radial Variations in the Io Plasma Torus during the Cassini Era , 2005 .

[21]  M. Kagitani,et al.  Jupiter's magnetospheric change by Io's volcanoes , 2010 .

[22]  W. M. Gray,et al.  The Abundance of O ++ in the Jovian Magnetosphere (Paper 92GL00070) 79 , 1992 .

[23]  L. Esposito,et al.  A NEW UNDERSTANDING OF THE EUROPA ATMOSPHERE AND LIMITS ON GEOPHYSICAL ACTIVITY , 2014 .

[24]  F. Bagenal.  Plasma conditions inside Io's orbit: Voyager measurements , 1985 .

[25]  Andrew J. Steffl,et al.  Cassini UVIS observations of the Io plasma torus. I. Initial results , 2004 .

[26]  R. Jaumann,et al.  Effects of the External Environment on Icy Satellites , 2010 .

[27]  M. Desch,et al.  Narrow‐band Jovian kilometric radiation: A new radio component , 1980 .

[28]  Robert E. Johnson,et al.  Planetary applications of ion induced erosion of condensed gas frosts , 1982 .

[29]  R. Stone,et al.  Source characteristics of Jovian hectometric radio emissions , 1993 .

[30]  D. G. Mitchell,et al.  Energetic neutral atoms from a trans-Europa gas torus at Jupiter , 2003, Nature.

[31]  N. Thomas,et al.  Detection of S (IV) 10.51 μm emission from the Io plasma torus , 2001 .

[32]  W. Paterson,et al.  Observations of plasmas in the Io torus with the Galileo spacecraft , 2000 .

[33]  Wing-Huen Ip,et al.  Europa's Oxygen Exosphere and Its Magnetospheric Interaction , 1996 .

[34]  N. Thomas,et al.  Io torus EUV emissions during the comet Shoemaker-Levy/9 impacts , 1995 .

[35]  A. Roux,et al.  Electron densities near Io from Galileo plasma wave observations , 2001 .

[36]  A. Eviatar,et al.  A two‐dimensional model of plasma transport and chemistry in the Jovian magnetosphere , 1998 .

[37]  R. Baragiola,et al.  Radiation-induced amorphization of crystalline ice , 2009 .

[38]  H. Mason,et al.  CHIANTI - an atomic database for emission lines - I. Wavelengths greater than 50 Å , 1997 .

[39]  F. Bagenal.  Empirical model of the Io plasma torus: Voyager measurements , 1994 .

[40]  M. Dougherty,et al.  Dynamics of the Jovian magnetosphere , 2007 .

[41]  Joachim Saur,et al.  Orbital apocenter is not a sufficient condition for HST/STIS detection of Europa’s water vapor aurora , 2014, Proceedings of the National Academy of Sciences.

[42]  D. Strobel,et al.  Energy partitioning in the Io plasma torus , 1985 .

[43]  Henry B. Garrett,et al.  Energetic Ion and Electron Irradiation of the Icy Galilean Satellites , 2001 .

[44]  Robert E. Johnson,et al.  Europa's neutral cloud: morphology and comparisons to Io , 2004 .

[45]  D. Intriligator,et al.  Detection of the Io plasma torus by Pioneer 10 , 1981 .

[46]  J. Cooper,et al.  Surface-bounded atmosphere of Europa , 2005 .

[47]  A. C. Riddle,et al.  Voyager 1 Planetary Radio Astronomy Observations Near Jupiter , 1979, Science.

[48]  D. Williams,et al.  In‐situ observations of a neutral gas torus at Europa , 2003 .

[49]  N. Schneider,et al.  Io’s neutral clouds, plasma torus, magnetospheric interaction , 2007 .

[50]  C. Pilcher,et al.  Spectrophotometric studies of the Io Torus , 1983 .

[51]  John W. Belcher,et al.  Positive ion observations in the middle magnetosphere of Jupiter , 1981 .

[52]  A. Roux,et al.  Galileo plasma wave observations near Europa , 1998 .

[53]  B. Burke,et al.  Observations of a variable radio source associated with the planet Jupiter , 1955 .

[54]  Donald A. Gurnett,et al.  Galileo Plasma Wave Observations in the Io Plasma Torus and Near Io , 1996, Science.

[55]  D. Hall,et al.  Disentangling electron temperature and density in the Io plasma torus , 1998 .

[56]  W. Paterson,et al.  Galileo observations of electron beams and thermal ions in Jupiter's magnetosphere and their relationship to the auroras , 2002 .

[57]  W. Paterson,et al.  Plasmas observed with the Galileo spacecraft during its flyby over Io's northern polar region , 2002 .

[58]  Peter A. Delamere,et al.  Modeling Variability of Plasma Conditions in the Io Torus , 2003 .

[59]  B. Sandel,et al.  Radial profiles of ion density and parallel temperature in the Io plasma torus during the Voyager 1 encounter , 1995 .

[60]  Christopher T. Russell,et al.  Intermittent short‐duration magnetic field anomalies in the Io torus: Evidence for plasma interchange? , 1997 .

[61]  J. Connerney,et al.  New models of Jupiter's magnetic field constrained by the Io flux tube footprint , 1998 .

[62]  C. Russell,et al.  Magnetic field changes in the inner magnetosphere of Jupiter , 2001 .

[63]  R. McNutt,et al.  Plasma Observations Near Jupiter: Initial Results from Voyager 1 , 1979, Science.

[64]  F. Bagenal,et al.  Cassini UVIS observations of the Io plasma torus. IV. Modeling temporal and azimuthal variability , 2007, 0705.4480.

[65]  J. D. Sullivan,et al.  Spatial distribution of plasma in the Io Torus , 1980 .

[66]  M. Desch,et al.  Planetary Radio Astronomy Observations from Voyager 2 Near Saturn , 1979, Science.

[67]  W. Paterson,et al.  Production of hydrogen ions at Io , 1999 .

[68]  D. D. Barbosa.  Neutral cloud theory of the Jovian nebula: Anomalous ionization effect of superthermal electrons , 1994 .

[69]  Paul D. Feldman,et al.  Transient Water Vapor at Europa’s South Pole , 2014, Science.

[70]  W. Paterson,et al.  Survey of thermal ions in the Io plasma torus with the Galileo spacecraft , 2001 .

[71]  Takeshi Sakanoi,et al.  Extreme Ultraviolet Radiation Measurement for Planetary Atmospheres/Magnetospheres from the Earth-Orbiting Spacecraft (Extreme Ultraviolet Spectroscope for Exospheric Dynamics: EXCEED) , 2014, Space Science Reviews.

[72]  J. B. Dalton,et al.  Magnetospheric ion sputtering and water ice grain size at Europa , 2013 .

[73]  H. Bridge,et al.  The low energy plasma in the Jovian magnetosphere , 1980 .

[74]  M. Kivelson,et al.  Galileo evidence for rapid interchange transport in the Io torus , 1997 .

[75]  A. Steffl,et al.  Modeling Temporal Variability of Plasma Conditions in the Io Torus during the Cassini Era , 2004 .

[76]  P. Canu,et al.  Detection of Bernstein wave forbidden bands in the Jovian magnetosphere: A new way to measure the electron density , 1997 .

[77]  K. Khurana,et al.  Observations of thermal plasmas in Jupiter's magnetotail , 2002 .

[78]  Cassini UVIS Observations of the Io Plasma Torus. III. Observations of Temporal and Azimuthal Variability , 2005, astro-ph/0508055.

[79]  D. Shemansky.  Ratio of oxygen to sulfur in the Io plasma torus , 1987 .

[80]  M. Kivelson,et al.  Europa's Interaction with the Jovian Magnetosphere , 2009 .

[81]  W. Paterson,et al.  Galileo plasma observations at Europa: Ion energy spectra and moments , 1999 .

[82]  F. Bagenal,et al.  Flow of mass and energy in the magnetospheres of Jupiter and Saturn , 2011 .

[83]  W. Paterson,et al.  Plasma Observations at Io with the Galileo Spacecraft , 1996, Science.

[84]  E. Grün,et al.  Impacts into Ice–Silicate Mixtures: Crater Morphologies, Volumes, Depth-to-Diameter Ratios, and Yield , 2001 .

[85]  Anna Milillo,et al.  The role of sputtering and radiolysis in the generation of Europa exosphere , 2012 .

[86]  D. Intriligator,et al.  First evidence for a Europa plasma torus , 1982 .

[87]  E. Bigg.  Influence of the Satellite Io on Jupiter's Decametric Emission , 1964, Nature.

[88]  A. Roux,et al.  The plasma wave environment of Europa , 2001 .

[89]  J. Morgan,et al.  Detection of Singly Ionized Oxygen Around Jupiter , 1979, Science.

[90]  W. Smyth,et al.  Europa's atmosphere, gas tori, and magnetospheric implications , 2006 .

[91]  Krishan K. Khurana,et al.  Euler potential models of Jupiter's magnetospheric field , 1997 .

[92]  R E Johnson,et al.  Cassini Finds an Oxygen–Carbon Dioxide Atmosphere at Saturn’s Icy Moon Rhea , 2010, Science.

[93]  P. Feldman,et al.  Detection of O II 2471-A forbidden line from the Io plasma torus , 1993 .

[94]  Denis Grodent,et al.  Model of the Jovian magnetic field topology constrained by the Io auroral emissions , 2011 .

[95]  V. Angelopoulos,et al.  Characteristics of plasma flows at the inner edge of the plasma sheet , 2011 .

[96]  B. Mauk,et al.  Ion sputtering and surface erosion at Europa , 1998 .

[97]  N. Thomas.  Detection of O III 5007-A forbidden line emission from the Io plasma torus , 1993 .

[98]  P. Schultz.  Effect of impact angle on vaporization , 1996 .

[99]  P. Louarn,et al.  Global magnetodisk disturbances and energetic particle injections at Jupiter , 2014 .

[100]  G. Murakami,et al.  Evidence for global electron transportation into the jovian inner magnetosphere , 2014, Science.

[101]  S. Okano,et al.  Relationship between the Jovian magnetospheric plasma density and Io torus emission , 2005 .

[102]  Andrew J. Steffl,et al.  Cassini UVIS observations of the Io plasma torus. II. Radial variations , 2004 .

[103]  H. Bridge,et al.  A survey of the plasma electron environment of Jupiter: A view from Voyager , 1981 .

[104]  P. Feldman,et al.  Extreme ultraviolet explorer satellite observation of Jupiter's Io plasma torus , 1994 .

[105]  Amanda R. Hendrix,et al.  Cassini UVIS observations of Europa's oxygen atmosphere and torus , 2005 .

[106]  D. Shemansky.  Radiative cooling efficiencies and predicted spectra of species of the IO plasma torus , 1980 .

[107]  A. Bar-Nun,et al.  Europan surface phenomena , 1985 .

[108]  K. Khurana,et al.  Global structure of Jupiter's magnetospheric current sheet , 2005 .

[109]  D. Gurnett,et al.  Broadband electrostatic noise and field‐aligned currents in Jupiter's middle magnetosphere , 1981 .

[110]  J. D. Sullivan,et al.  Direct plasma measurements in the Io torus and inner magnetosphere of Jupiter , 1981 .

[111]  Rosaly M. C. Lopes,et al.  Atmospheric/Exospheric Characteristics of Icy Satellites , 2010 .

[112]  M. Kivelson,et al.  24 - The configuration of Jupiter's magnetosphere , 2004 .

[113]  D. Gurnett,et al.  Anisotropy and proton density in the Io plasma torus derived from whistler wave dispersion , 1996 .

[114]  S. Hess,et al.  Longitudinal modulation of hot electrons in the Io plasma torus , 2011 .

[115]  M. Moncuquet,et al.  Temperature Inversion in the Io Plasma Torus , 1995 .

[116]  Donald A. Gurnett,et al.  A study of the Jovian “energetic magnetospheric events” observed by Galileo: role in the radial plasma transport , 2000 .