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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >On the origin of Saturn's outer auroral emission
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On the origin of Saturn's outer auroral emission

机译：土星的起源外极光发射

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Ultraviolet Hubble Space Telescope images reveal a faint but distinct auroral emission equatorward of the main ring of emission-of Saturn's southern polar region. This outer auroral emission is only visible near the nightside limb for the strongly tilted viewing geometry achieved in January 2004. We model the limb-brightening amplification of this emission, and we show that the observations arc compatible with an ～7° wide emission ring approximately centered on the 67°S parallel. The 1.7 kR brightness of this emission requires an injected electron energy flux of ～0.3 mWm~(-2).The outer auroral emission maps to a region of the equatorial plane between 4 and 11 R_s. We suggest that a population of suprathermal electrons observed by Cassini can provide more than the required energy flux without the need for field-aligned acceleration. This auroral UV emission may also be associated with energetic neutral oxygen and hydrogen atoms originating from the energetic protons and O~+ of magnetosphere and/or with a secondary infrared auroral oval.
机译：紫外线哈勃太空望远镜的图像显示微弱但不同的极光排放朝赤道方向排放的主要环土星的南部极地地区。可见在阴面强烈的肢体2004年1月倾斜观测几何实现。我们模型的limb-brightening放大这个发射,我们表明,观察弧兼容一个~ 7°宽发射戒指大约以67°S平行。1.7 kR亮度的排放要求~ 0.3的注入电子能量通量微波加工~(2)。地区之间的赤道平面4和11所示R_s。电子观测到卡西尼号可以提供更多比所需的能量流而不需要field-aligned加速度。排放也可能与能量有关中性氢和氧的原子原始高能质子和O ~ +的磁气圈和/或辅助红外极光椭圆。

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