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High energy density soft X-ray momentum coupling to comet analogs for NEO mitigation

机译:高能量密度的软X射线动量耦合到彗星类似物以减轻NEO

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摘要

We applied MBBAY high fluence pulsed radiation intensity driven momentum transfer analysis to calculate Xray momentum coupling coefficients C-M=(Pa s)/(J/m(2)) for two simplified comet analog materials: i) water ice, and ii) 70% water ice and 30% distributed olivine grains. The momentum coupling coefficients (C-M) (max) of 50x10(-5) s/m, are about an order of magnitude greater than experimentally determined and computed MBBAY values for meteoritic materials that are analogs for asteroids. From the values for comet analog materials we infer applied energies (via momentum transfer) required to deflect an Earth crossing comet from impacting Earth by a sufficient amount (-1 cm/s) to avert collision-a year in advance. Comet model calculations indicate for C-M=5x10(-4) s/m the deflection of a 2 km comet with a density 600 kg/m(3) by 1 cm/s requires an applied energy on the target surface of 5x10(13) J, the equivalent of 12 kT of TNT. Depending on the geometrical configuration of the interaction the explosive yield required could be an order of magnitude higher.
机译:我们使用MBBAY高通量脉冲辐射强度驱动动量传递分析来计算两种简化的彗星模拟材料的X射线动量耦合系数CM =(Pa s)/(J / m(2)):i)水冰,ii)70%水冰和30%的橄榄石颗粒分布。 50x10(-5)s / m的动量耦合系数(C-M)(最大值)比小行星类似物陨石的实验确定和计算的MBBAY值大一个数量级。从彗星模拟材料的值中,我们提前一年推算了使穿越地球的彗星偏离足以撞击地球的量(-1 cm / s)所需的施加能量(通过动量传递)。彗星模型计算表明,对于CM = 5x10(-4)s / m,密度为600 kg / m(3)的1 km / s的2 km彗星偏转需要在目标表面上施加5x10(13)的能量J,相当于12 kT的TNT。根据相互作用的几何构型,所需的炸药产量可能会高一个数量级。

著录项

  • 来源
    《Acta astronautica》 |2016年第12期|384-388|共5页
  • 作者单位

    Harvard Univ, Dept Astron, 20 Oxford St, Cambridge, MA 02138 USA|Harvard Univ, Dept Earth & Planetary Sci, 20 Oxford St, Cambridge, MA 02138 USA|Harvard Smithsonian Ctr Astrophys, 60 Garden St, Cambridge, MA 02138 USA;

    Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA;

    Harvard Univ, Dept Earth & Planetary Sci, 20 Oxford St, Cambridge, MA 02138 USA;

    Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
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