论文标题
狄奥尼（Dione）的射线火山口：对主要表面变化过程的影响
Rayed craters on Dione: Implication for the dominant surface alteration process
论文作者
论文摘要
从Cassini航天器获得的最近获得的高分辨率图像中，我们检查了Dione上射线火山口的模式和空间分布。我们识别29个射线火山口，直径大于狄奥的表面大于2km。射线陨石坑的密度和理论的壁层速率表明，狄奥尼（Dione）射线的保留时间约为1-50 my。如此短的保留时间被解释为是由于血浆和电子环颗粒的轰击以及黑暗颗粒的植入（大概是在Hyperion，Iapetus和其他土星卫星上发现的相同的深色材料）。我们还发现，当形成Creusa火山口的射线系统时，它会在狄奥尼的大部分表面上延伸。后来，沉积在后半球上的射线系统可能被部分删除，这主要是由于植入了深色颗粒，这也可能已经去除了该区域中其他明亮的射线系统。 Creusa的射线系统的模式意味着，黑暗物质的植入比Creusa火山口时代和狄奥尼（Dione）射线的典型保留时间更新。
From recently-acquired, high-resolution images obtained by the Cassini spacecraft, we examine the patterns and spatial distributions of rayed craters on Dione. We identify 29 rayed craters with diameters larger than 2km on Dione's surface. The density of rayed craters and theoretical cratering rates indicate that the retention time for rays on Dione can be approximately 1-50 My. Such a short retention time is interpreted to be due to bombardment of plasma and E-ring particles, as well as implantation of dark particles (presumably the same dark material found on Hyperion, Iapetus, and other saturnian satellites). We also find that when the ray system of Creusa crater was formed, it extended over most of the surface of Dione. Later, the ray system deposited on the trailing hemisphere might have been partially erased, mostly due to implantation of dark particles, which may have also removed other bright ray systems in that region. The pattern of Creusa's ray system implies that the implantation of the dark material occurred more recent than both the age of Creusa crater and the typical retention time for rays on Dione.
