Reconnection at the magnetopause of Saturn: Perspective from FTE occurrence and magnetosphere size

H. R. Lai; H. Y. Wei; C. T. RussellC. S. ArridgeM. K. Dougherty

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Reconnection at the magnetopause of Saturn: Perspective from FTE occurrence and magnetosphere size

机译：重新连接在土星磁层:视角从FTE发生和磁场大小

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Flux transfer events observed at Mercury, Earth, and Jupiter are attributed to spatially and temporally limited events in which the magnetosheath and magnetospheric magnetic field become interconnected and magnetic flux is transported from the dayside to the lobes of the magnetotail. Examination of the Saturnian magnetopause at local times from 1000 to 1400 shows no evidence for this phenomenon. Nevertheless, we do find brief intervals during which the normal component of the magnetic field across the magnetopause becomes significantly enhanced for typically one to ten minutes. Magnetosheath electrons appear during these episodes of enhanced magnetic field normal components indicating that indeed the magnetosphere is connected to the magnetosheath by these magnetic bridges. To determine if this magnetic connection leads to a measurable transfer of magnetic flux from the dayside, we check the location of the magnetopause standoff distance for both northward and southward magnetosheath fields. In 71 crossings, we find no obvious dependence of the distance on the direction of the magnetosheath field, indicating that the direction of the interplanetary magnetic field is not a major factor in the determination of the location of the Saturnian magnetopause. This is unlike the position of the terrestrial magnetosphere that undergoes significant motion through reconnection with the interplanetary magnetic field.

机译：通量传输事件观察到水星,地球,由于空间和和木星暂时的有限的事件磁鞘和磁性层的磁场成为互联和磁通从的光面运送至的叶磁尾。磁层在当地时间从1000年到1400年没有证据显示这一现象。然而,我们发现短暂的间隔期间磁场的法向分量在磁层变得明显增强通常一到十分钟。磁鞘电子出现在这磁场的增强正常确实表明组件磁气圈是连接到磁鞘这些磁桥。磁性连接导致可衡量的转移的磁通量的光面,我们检查磁对峙的位置向北和向南的距离磁鞘字段。明显的依赖的距离方向的磁鞘字段,表示行星际磁场的方向字段不确定的一个主要因素农神磁层的位置。这是不同于陆地的位置磁气圈,经历了显著的运动通过与星际重新连接磁场。

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《Journal of Geophysical Research, A. Space Physics: JGR》 |2012年第5期|A05222:1-A05222:9|共9页
作者
H. R. Lai; H. Y. Wei; C. T. RussellC. S. ArridgeM. K. Dougherty;
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作者单位

Mullard Space Science Laboratory, University College London London, UK;

ICSTM, Imperial College London, London, UK;

IGPP, University of California, Los Angeles, California, USA;

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正文语种英语
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关键词
magnetopause; Saturn; magnetic fieldINTERPLANETARY MAGNETIC FIELDSmagnetosheath;

机译：土星磁层;磁fieldINTERPLANETARY磁FIELDSmagnetosheath;

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Reconnection at the magnetopause of Saturn: Perspective from FTE occurrence and magnetosphere size

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