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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Fate of Ice Grains in Saturn's Ionosphere
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Fate of Ice Grains in Saturn's Ionosphere

机译：冰颗粒在土星的电离层的命运

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It has been proposed that the rings of Saturn can contribute both material (i.e., water) and energy to its upper atmosphere and ionosphere. Ionospheric models require the presence of molecular species such as water that can chemically remove ionospheric protons, which otherwise are associated with electron densities that greatly exceed those from observation. These models adopt topside fluxes of water molecules. Other models have shown that ice grains from Saturn's rings can impact the atmosphere, but the effects of these grains have not been previously studied. In the current paper, we model how ice grains deposit both material and energy in Saturn's upper atmosphere as a function of grain size, initial velocity (at the "top" of the atmosphere, defined at an altitude above the cloud tops of 3,000 km), and incident angle. Typical grain speeds are expected to be roughly 15-25 km/s. Grains with radii on the order of 1-10 nm deposit most of their energy in the altitude range of 1,700-1,900 km, and can vaporize, depending on initial velocity and impact angle, contributing water mass to the upper atmosphere. We show that grains in this radius range do not significantly vaporize in our model at initial velocities lower than about 20 km/s.
机译：它提出了土星光环贡献物质(例如,水)和能量它的上层大气电离层。电离层模型需要的存在水,可以等分子物种化学消除电离层质子,否则与电子密度有关大大超过那些来自观察。模型采用上部通量的水分子。其他模型表明,冰颗粒土星的光环会影响大气,但是这些谷物没有之前的影响研究。颗粒沉积物质和能量土星的上层大气的函数大小、初始速度(“顶级”的大气,海拔高于定义云的3000公里)和入射角。典型的颗粒速度预计将大约15 - 25公里/秒。1 - 10 nm存款大部分能量高度射程1700 - 1900公里,可以蒸发,这取决于初始速度影响角度,水质量作出贡献上层大气。半径范围内没有明显的蒸发模型初始速度低于20

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