Juno In Situ Observations Above the Jovian Equatorial Ionosphere

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  • P. W. Valek
    Southwest Research Institute San Antonio TX USA
  • F. Bagenal
    Laboratory for Atmospheric and Space Physics University of Colorado Boulder Boulder CO USA
  • R. W. Ebert
    Southwest Research Institute San Antonio TX USA
  • F. Allegrini
    Southwest Research Institute San Antonio TX USA
  • D. J. McComas
    Department of Astrophysical Sciences Princeton University Princeton NJ USA
  • J. R. Szalay
    Department of Astrophysical Sciences Princeton University Princeton NJ USA
  • R. J. Wilson
    Department of Physics and Astronomy University of Texas at San Antonio San Antonio TX USA
  • S. J. Bolton
    Southwest Research Institute San Antonio TX USA
  • J. E. P. Connerney
    Space Research Corporation Annapolis MD USA

書誌事項

公開日
2020-06-23
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#am
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1029/2020gl087623
公開者
American Geophysical Union (AGU)

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説明

<jats:title>Abstract</jats:title><jats:p>The arrival of Juno at Jupiter enables repeated in situ observations above the Jovian ionosphere. The low altitude and high velocity of Juno at perijove permits direct sampling of ionospheric ion populations. We present the first direct observations above the ionosphere made by the Jovian Auroral Distributions Experiment Ion sensor (JADE‐I). When looking into the spacecraft ram direction, JADE‐I can measure ion energy distributions to below 1 eV/q along with ion composition. We report observations from 17 Juno perijove passes. At these latitudes, the low energy ions consist of protons and heavier ions, protons being the dominant species. Heavy ions—primarily oxygen and sulfur likely originating from the magnetosphere—are seen each pass, but their intensity varies. Other trace light ions are observed during some of the perijoves: H<jats:sub>3</jats:sub><jats:sup>+</jats:sup> (6 of 17 perijoves), He<jats:sup>+</jats:sup> (2 of 17 perijoves). Ionospheric ions are observed up to altitudes of ~7,000 km.</jats:p>

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