METEORITE AND ASTEROID REFLECTANCE SPECTROSCOPY: Clues to Early Solar System Processes
METEORITE AND ASTEROID REFLECTANCE SPECTROSCOPY: Clues to Early Solar System Processes
复制标题
陨石和小行星反射光谱：早期太阳系过程的线索
DOI：
10.1146/annurev.ea.22.050194.002325
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发表时间：
1994
影响因子：
14.9
通讯作者：
L. McFadden
中科院分区：
文献类型：
--
作者：
C. Pieters;L. McFadden
尽管地球有一个磁屏蔽可以保护它免受高能离子的侵害，并且有一个缓冲大气层可以捕获每天轰击地球的大量小颗粒（<1毫米），但来自地外来源的固体物质每年仍然会多次到达地球表面（Dodd 1 98 1）。当这些天体中最大的一个以极快的速度撞击地表时，它们会释放出巨大的能量，通常会形成一个陨石坑，并经常破坏陆地生物圈。幸运的是，此类事件发生的频率相对较低，尽管个人影响目前无法通过统计核算来预测（Shoemaker et al 1979, Grieve 1 982）。大小介于小尘埃颗粒和较大陨石坑形成体之间的宇宙物质在进入地球时会被地球大气减慢。这些物体的最外层部分在通过过程中熔化和烧蚀，形成保护内部的熔壳，然后它们着陆
Although Earth has a magnetic shield that protects it from energetic ions and a cushioning atmosphere that catches the tons of small particles ( < I mm) that bombard it daily, solid material from extraterrestrial sources nevertheless reaches the surface of Earth many times a year (Dodd 1 98 1 ). When the largest of these bodies impact the surface with great velocity, they release immense energy, usually form a crater, and often disrupt the terrestrial biosphere. Fortunately, such events occur relatively infrequently, although individual impacts are currently unpredictable beyond a statistical accounting (Shoemaker et al 1979, Grieve 1 982). Cosmic material between the size of small dust particles and the larger crater-forming bodies is slowed by the terrestrial atmosphere upon entry. The outermost portion of these objects is melted and ablated during passage forming a fusion crust which protects the interior, and they land