• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>AIAA aerospace sciences meeting;AIAA SciTech Forum >Impactor Missions to Europa and Ganymede: Seismic Approach for Estimating Icy Crust Thicknesses
【24h】

Impactor Missions to Europa and Ganymede: Seismic Approach for Estimating Icy Crust Thicknesses

机译：撞击欧罗巴和木卫三的任务：估算冰冷结壳厚度的地震方法

获取原文
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Jupiter's satellite Europa is believed to harbor a global ocean beneath its ice-covered surface. The thickness of the ice, despite its significance to the habitability of this moon, is currently unknown. Estimates range from as thin as hundreds of meters to as thick as tens of kilometers. A subsurface ocean is also expected at Ganymede. In this paper, we propose a mission to measure the thickness of the icy crust via seismic analysis, enabled by an artificial impactor striking the surface of the icy satellite where a seismometer would be placed in advance. We envision the impact analysis to be a complementary experiment, rather than a primary objective, of a mission to the icy moons of Jupiter. Two possibilities for the impactor are considered: (1) an orbiter probe impacting a satellite at the end of its life, and (2) a spent rocket stage impacting a satellite upon Jupiter arrival. The end-of-life impact of an orbiter would represent a low-energy impact case, whereas the beginning-of-mission impact of the spent rocket stage would represent a high-energy impact case. Our preliminary analysis shows that the majority of the impact energy would be converted into Shockwave. For example, the estimated energy of Shockwave for the high-impact-energy case was estimated to be 8.13×10~(10) J (an equivalent of 19.4 t of TNT), which is likely sufficient to determine the thickness of the icy crust via seismic analyses.
机译：据信，木星的卫星欧罗巴在其冰雪覆盖的表层之下藏有全球海洋。尽管冰的厚度对月球的可居住性具有重要意义，但目前尚不清楚。估计范围从薄到数百米到厚达几十公里。盖尼米德（Ganymede）也将有一个地下海洋。在本文中，我们提出了一个任务，该任务是通过地震分析来测量冰壳的厚度，这是由人造撞击器撞击冰卫星的表面（事先放置了地震仪）实现的。我们设想将影响分析作为对木星冰冷卫星执行任务的补充实验，而不是主要目标。考虑了撞击器的两种可能性：（1）一枚轨道探测器在其寿命尽头撞击一枚卫星;（2）一个耗尽的火箭载物台在木星到达时撞击一枚卫星。轨道飞行器的寿命终止影响将代表低能影响情况，而废火箭级的飞行任务开始影响将代表高能影响情况。我们的初步分析表明，大部分冲击能量将转换为冲击波。例如，对于高冲击能量情况，冲击波的估计能量估计为8.13×10〜（10）J（相当于TNT的19.4 t），可能足以确定冰壳的厚度通过地震分析。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号