Location of Saturn's northern infrared aurora determined from Cassini VIMS images SATURN'S NORTHERN INFRARED AURORA
Location of Saturn's northern infrared aurora determined from Cassini VIMS images SATURN'S NORTHERN INFRARED AURORA
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根据卡西尼号 VIMS 图像确定土星北红外极光的位置 土星北红外极光
DOI：
10.1029/2010gl046193
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发表时间：
2011
影响因子：
5.2
通讯作者：
Badman S
中科院分区：
文献类型：
--
作者：
Badman S
卡西尼号VIMS在2006-2008年间拍摄了12张精选图像，详细描述了土星北红外极光的位置。明亮的主椭圆弧和普遍的极地特征被显示出来，这并不表现出首选的当地时间或空间范围。极光的平均赤道向极限是用最佳拟合圆法确定的。平均圆周半径为北纬16.4±0.2°，中心距土星极点反太阳1.6°。拟合圆半径的低标准差(<；1°)表明赤道向极光边界的相对稳定性。我们首次发现红外椭圆的平均位置与紫外线椭圆的平均位置相似，这表明不同波长的极光发射很可能是由共同的驱动程序产生的，尽管发射机制不同。
The location of Saturn's northern infrared aurora is described in detail using 12 selected images acquired by Cassini VIMS during 2006–2008. Bright main oval arcs and prevalent polar features are displayed, which do not exhibit a preferred local time or spatial extent. The average equatorward limit of the aurora was determined using a best fit circle method. The average circle has a radius of 16.4 ± 0.2° latitude, centred 1.6° anti‐sunward of Saturn's pole. The low standard deviation of the fitted circle radii (<1°) indicates the relative stability of the equatorward auroral boundary. For the first time we show that the average location of the infrared oval is similar to that of the ultraviolet oval, suggesting that the auroral emissions at different wavelengths are very likely produced by a common driver despite the distinct emission mechanisms.