Implications of Jovian X‐ray emission for magnetosphere‐ionosphere coupling
Thomas E. Cravens,J. H. Waite,Tamas I. Gombosi,Noé Lugaz,G. R. Gladstone,Barry Mauk,Robert J. MacDowall +6 more
TL;DR: In this paper, the authors developed scenarios in which the X-ray emission is produced by energetic heavy ion precipitation, either on open field lines connecting to the solar wind or on closed field lines reaching to the outer magnetosphere.
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Abstract: [1] The first observations of Jupiter made by the Chandra X-Ray Observatory revealed a powerful X-ray aurora located in the polar caps. The X-ray emission exhibited a 40-min periodicity. Such 40-min periodicities have previously been seen in energetic particle fluxes and in Jovian radio emission. This paper develops scenarios in which the X-ray emission is produced by energetic heavy ion precipitation, either on open field lines connecting to the solar wind or on closed field lines reaching to the outer magnetosphere. In order to produce enough X-ray power, both scenarios require the existence of field-aligned electric fields located somewhere between the ionosphere and the magnetosphere, most likely at a radial distance of a few Jovian radii. The potential needed for solar wind ions to produce the observed X-rays is about 200 kV and the potential needed for the magnetospheric ions is at least 8 MV. Protons and helium ions are also accelerated by the potential and should produce an intense ultraviolet aurora. Downward electrical current is carried by the precipitating ions and also by upwardly accelerated secondary electrons produced by the primary ion precipitation. The estimated downward Birkeland current is about 1000 MA for the solar wind case and is about 10 MA for the magnetospheric case. For the magnetosphere scenario, this observed current represents part of the “return” current portion of the magnetospheric circuit associated with the departure of the mass-loaded magnetospheric plasma from corotation. The auroral X-ray emission maps at least part of this return current in the polar cap, whereas the main oval, produced by electron precipitation, is thought to map the region of upward Birkeland currents. The accelerated secondary electrons could be responsible for the periodic radio emission (i.e., QP-40 bursts).
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Citations
Energetic ion characteristics and neutral gas interactions in Jupiter's magnetosphere
Barry Mauk,D. G. Mitchell,R. W. McEntire,Chris Paranicas,Edmond C. Roelof,D. J. Williams,Stamatios M. Krimigis,Andreas Lagg +7 more
TL;DR: In this article, spectral, integral moments, and composition (H, He, O, S) of energetic ions (50 keV to 50 MeV) are presented for selected Jupiter magnetospheric positions near the equator between radial distances of ∼6 to ∼46 Jupiter radii (RJ), as revealed by analysis of the Galileo Energetic Particle Detector data.
263
X-rays from solar system objects
Anil Bhardwaj,Ronald F. Elsner,G. Randall Gladstone,Thomas E. Cravens,Carey M. Lisse,Konrad Dennerl,Graziella Branduardi-Raymont,Bradford J. Wargelin,J. Hunter Waite,Ina Robertson,Nikolai Østgaard,Peter Beiersdorfer,Steven L. Snowden,Vasili Kharchenko +13 more
TL;DR: In this paper, the authors present a review of the X-ray emission from the solar system bodies, excluding the Sun, and an overview of the main source mechanisms of Xray production at each object.
179
Auroral Processes at the Giant Planets: Energy Deposition, Emission Mechanisms, Morphology and Spectra
Sarah V. Badman,Sarah V. Badman,Graziella Branduardi-Raymont,Marina Galand,Sebastien Hess,Norbert Krupp,Laurent Lamy,Henrik Melin,Chihiro Tao,Chihiro Tao +9 more
TL;DR: In this article, the ionospheric response to auroral precipitation at the giant planets is reviewed, using models and observations The emission processes for aurorae at radio, infrared, visible, ultraviolet, and X-ray wavelengths are described, and exemplified using ground-and space-based observations Comparisons between the emissions at different wavelengths are made, where possible, and interpreted in terms of precipitating particle characteristics or atmospheric conditions.
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Imaging Plasma Density Structures in the Soft X-Rays Generated by Solar Wind Charge Exchange with Neutrals
David G. Sibeck,Robert Allen,Homayon Aryan,Dennis Bodewits,Pontus Brandt,Graziella Branduardi-Raymont,Gregory V. Brown,J. A. Carter,Y. M. Collado-Vega,Michael R. Collier,Hyunju Connor,Thomas E. Cravens,Yuichiro Ezoe,Mei-Ching Fok,Massimiliano Galeazzi,Olga Gutynska,Mats Holmström,Syau-Yun Hsieh,Kumi Ishikawa,Dimitra Koutroumpa,Kip D. Kuntz,Maurice A. Leutenegger,Maurice A. Leutenegger,Yoshizumi Miyoshi,Frederick S. Porter,Michael E. Purucker,A. M. Read,Joachim Raeder,Ina Robertson,Andrey Samsonov,Steve Sembay,Steven L. Snowden,N. E. Thomas,N. E. Thomas,R. von Steiger,Brian Walsh,Simon Wing +36 more
- 02 May 2019
TL;DR: In this article, the authors present a review of efforts to image the diagnostic plasma density structures in the soft (low energy, 0.1-2.0 keV) X-rays produced when high charge state solar wind ions exchange electrons with the exospheric neutrals surrounding solar system obstacles.
104
Solar control on Jupiter's equatorial X-ray emissions: 26-29 November 2003 XMM-Newton observation
Anil Bhardwaj,Anil Bhardwaj,G. Branduardi-Raymont,R. F. Elsner,G. R. Gladstone,Gavin Ramsay,Pedro Rodríguez,Roberto Soria,J. H. Waite,Thomas E. Cravens +9 more
TL;DR: In this article, the authors present simultaneous lightcurves of Jovian equatorial X-ray and solar X-rays measured by the GOES, SOHO/SEM, and TIMED/SEE satellites.
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