Observations of Ejecta Clouds Produced by Impacts onto Saturn’s Rings
Observations of Ejecta Clouds Produced by Impacts onto Saturn’s Rings
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对土星环撞击产生的喷射云的观测
DOI：
10.1126/science.1233524
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发表时间：
2013
期刊：
影响因子：
56.9
通讯作者：
M. Evans
中科院分区：
文献类型：
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作者：
M. Tiscareno;Colin J. Mitchell;Carl D. Murray;Daiana Di Nino;M. Hedman;Jürgen Schmidt;Joseph A. Burns;J. Cuzzi;C. Porco;K. Beurle;M. Evans
在2009年的春分，当太阳从侧面照射土星环时，卡西尼号飞船拍摄的图像显示，土星环上方出现了明亮的条纹状尘埃云。2005年和2012年，卡西尼号在近距离观测C环时也发现了类似的条纹。Tiscareno等人（第460页）认为，每一个观测到的特征都可能是由于流星体撞击土星环而产生的一股最近被破坏的物质流的影响，并由此得出了流星体流入土星的速率。卡西尼号宇宙飞船的观测提供了流星体撞击土星环的证据。我们报告了对土星环上尘埃云的观测结果，我们将其解释为在观测到尘埃云之前1到50小时发生的对土星环的影响。其中最大的云被观测了两次；它的亮度和斜角的演变与这一假设一致。有几个论点认为，这些云不可能是由于一个固体流星体对土星环的主要影响，而是由于先前一个流星体解体后产生的土星轨道物质的致密流的影响。负责的行星际流星体最初的大小在1厘米到几米之间，它们的流入速度与之前关于太阳系外较小流星体的稀疏知识相一致。
Saturn's Meteoroid Crash During Saturn's equinox in 2009, when the Sun illuminated its rings edge-on, images taken by the Cassini spacecraft showed dust clouds appearing as bright streaks above the rings. Similar streaks were detected in 2005 and 2012 when Cassini observed the C ring at close range. Tiscareno et al. (p. 460) suggest that the cause of each observed feature is likely to be the impact of a stream of recently disrupted material originating from a meteoroid impact onto the ring and derive the influx rate of meteoroids at Saturn. Observations by the Cassini spacecraft provide evidence of meteoroid impacts onto Saturn’s rings. We report observations of dusty clouds in Saturn’s rings, which we interpret as resulting from impacts onto the rings that occurred between 1 and 50 hours before the clouds were observed. The largest of these clouds was observed twice; its brightness and cant angle evolved in a manner consistent with this hypothesis. Several arguments suggest that these clouds cannot be due to the primary impact of one solid meteoroid onto the rings, but rather are due to the impact of a compact stream of Saturn-orbiting material derived from previous breakup of a meteoroid. The responsible interplanetary meteoroids were initially between 1 centimeter and several meters in size, and their influx rate is consistent with the sparse prior knowledge of smaller meteoroids in the outer solar system.
流星体撞击土星环的流体动力学和辐射传输模型
DOI：
--
发表时间：
2008
期刊：
Icarus 194
影响因子：
--
作者：
Chambers;L. S.;J. N. Cuzzi;E. Asphaug;J. Colwell and S. Sugita
通讯作者：
J. Colwell and S. Sugita