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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Cassini multi-instrument assessment of Saturn’s polar cap boundary
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Cassini multi-instrument assessment of Saturn’s polar cap boundary

机译：卡西尼号土星的multi-instrument评估极冠边界

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摘要

We present the first systematic investigation of the polar cap boundary in Saturn’s high-latitude magnetosphere through a multi-instrument assessment of various Cassini in situ data sets gathered between 2006 and 2009. We identify 48 polar cap crossings where the polar cap boundary can be clearly observed in the step in upper cutoff of auroral hiss emissions from the plasma wave data, a sudden increase in electron density, an anisotropy of energetic electrons along the magnetic field, and an increase in incidence of higher-energy electrons from the low-energy electron spectrometer measurements as we move equatorward from the pole. We determine the average level of coincidence of the polar cap boundary identified in the various in situ data sets to be 0.34° ± 0.05° colatitude. The average location of the boundary in the southern (northern) hemisphere is found to be at 15.6° (13.3°) colatitude. In both hemispheres we identify a consistent equatorward offset between the poleward edge of the auroral upward directed field-aligned current region of ~1.5–1.8° colatitude to the corresponding polar cap boundary. We identify atypical observations in the boundary region, including observations of approximately hourly periodicities in the auroral hiss emissions close to the pole. We suggest that the position of the southern polar cap boundary is somewhat ordered by the southern planetary period oscillation phase but that it cannot account for the boundary’s full latitudinal variability. We find no clear evidence of any ordering of the northern polar cap boundary location with the northern planetary period magnetic field oscillation phase.
机译：我们提出的第一个系统的调查土星的高纬度地区的极冠边界通过multi-instrument磁气圈评估各种原位卡西尼号的数据集聚集在2006年和2009年之间。极冠口岸极冠边界的地方可以清楚地观察到在上一步吗截止极光嘶嘶声排放的等离子体波数据,电子密度的突然增加,一个各向异性的高能电子磁场,发病率的增加从低能量的高能电子电子能谱仪测量移动从北极朝赤道方向。平均水平的极地冰冠的巧合在各种现场数据边界识别设置为0.34°±0.05°余纬度。南部边界的位置(北部)半球是发现在15.6°(13.3°)余纬度。确定一致的朝赤道方向偏移极光的边缘向极向上的指导field-aligned当前地区-1.8 ~ 1.5°余纬度到相应的极地冰冠边界。边界地区,包括观测在极光大约每小时周期的研究嘶嘶声排放接近北极。极冠南部边界的位置有点命令的南部行星吗但是它不能周期振荡阶段占边界的纬度可变性。订购的极冠北部边界位置与行星北部磁场振动阶段。

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