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首页> 外文期刊>Planetary and space science >Recurrent energization of plasma in the midnight-to-dawn quadrant of Saturn's magnetosphere, and its relationship to auroral UV and radio emissions
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Recurrent energization of plasma in the midnight-to-dawn quadrant of Saturn's magnetosphere, and its relationship to auroral UV and radio emissions

机译:土星磁层午夜至黎明象限中等离子体的反复通电及其与极光紫外线和无线电发射的关系

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摘要

We demonstrate that under some magnetospheric conditions protons and oxygen ions are accelerated once per Saturn magnetosphere rotation, at a preferred local time between midnight and dawn. Although enhancements in energetic neutral atom (ENA) emission may in general occur at any local time and at any time in a Saturn rotation, those enhancements that exhibit a recurrence at a period very close to Saturn's rotation period usually recur in the same magnetospheric location. We suggest that these events result from current sheet acceleration in the 15-20 Rs range, probably associated with reconnection and plasmoid formation in Saturn's magnetotail. Simultaneous auroral observations by the Hubble Space Telescope (HST) and the Cassini Ultraviolet Imaging Spectrometer (UV1S) suggest a close correlation between these dynamical magnetospheric events and dawn-side transient auroral brightenings. Likewise, many of the recurrent ENA enhancements coincide closely with bursts of Saturn kilometric radiation, again pointing to possible linkage with high latitude auroral processes. We argue that the rotating azimuthal asymmetry of the ring current pressure revealed in the ENA images creates an associated rotating field aligned current system linking to the ionosphere and driving the correlated auroral processes.
机译:我们证明,在某些磁层条件下,土星磁层每旋转一周,就会在午夜到黎明之间的首选本地时间使质子和氧离子加速一次。尽管高能中性原子(ENA)发射的增强通常可能会在土星旋转的任何本地时间和任何时间发生,但那些在非常接近土星旋转周期的周期内出现复发的增强通常会在相同的磁层位置发生。我们认为这些事件是由于当前的表层加速度在15-20 Rs范围内引起的,可能与土星磁尾中的重新连接和质体形成有关。哈勃太空望远镜(HST)和卡西尼紫外线成像光谱仪(UV1S)进行的同时极光观测表明,这些动态磁层事件与黎明侧瞬时极光增亮之间存在密切的相关性。同样,许多周期性的ENA增强与土星公里辐射的爆发非常吻合,再次表明可能与高纬度极光过程联系在一起。我们认为,在ENA图像中揭示的环流压力的旋转方位角不对称会创建关联的旋转场对准电流系统,该系统链接到电离层并驱动相关的极光过程。

著录项

  • 来源
    《Planetary and space science》 |2009年第15期|p.1732-1742|共11页
  • 作者单位

    Johns Hopkins University Applied Physics Laboratory, MP3 E-132, 11100 Johns Hopkins Road, Laurel, MD 21042, USA;

    Johns Hopkins University Applied Physics Laboratory, MP3 E-132, 11100 Johns Hopkins Road, Laurel, MD 21042, USA;

    Johns Hopkins University Applied Physics Laboratory, MP3 E-132, 11100 Johns Hopkins Road, Laurel, MD 21042, USA;

    Johns Hopkins University Applied Physics Laboratory, MP3 E-132, 11100 Johns Hopkins Road, Laurel, MD 21042, USA;

    Johns Hopkins University Applied Physics Laboratory, MP3 E-132, 11100 Johns Hopkins Road, Laurel, MD 21042, USA;

    Johns Hopkins University Applied Physics Laboratory, MP3 E-132, 11100 Johns Hopkins Road, Laurel, MD 21042, USA;

    Department of Physics and Astronomy, University of Iowa, Iowa City, IA, USA;

    Department of Physics and Astronomy, University of Iowa, Iowa City, IA, USA;

    Center for Space Physics Boston University, Boston, USA;

    Department of Physics and Astronomy, University of Leicester, Leicester, UK;

    Laboratoire de Physique Atmospherique et Planetaire Universite de Liege, Belgium;

    Laboratoire de Physique Atmospherique et Planetaire Universite de Liege, Belgium;

    Blackett Laboratory, Imperial College, London, UK;

    Central Arizona College, Coolidge, AZ, USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    saturn; ena; ring current; saturn kilometric radiation; aurora;

    机译:土星;ena;环流;土星千米辐射;极光;

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