微流星消融对中高层区域金属层的影响  

Impact of the Ablation of Micro Meteoric Particle on the Metallic Layer in Mesosphere

作　　者：李华波[1] 易帆[1] 

机构地区：[1]武汉大学电子信息学院,武汉430079

出　　处：《空间科学学报》2007年第1期41-46,共6页Chinese Journal of Space Science

基　　金：国家自然科学基金重点项目(40336054);面上项目(40474059)共同资助

摘　　要：采用连续的微流星体消融模型,对小微粒的流星颗粒(半径＜100μm)消融过程进行分析,并估计对中高层区域(80～110 km)金属层的影响．无线电流星雷达与激光雷达的探测结果表明,半径在100μm以上的流星颗粒的消融物并不是金属层主要的源．本文从流星颗粒的动量方程和能量方程出发,计算不同半径下的流星微粒在不同的注入速度下的消融剖面,并分析了流星消融截止高度的变化趋势．结合长期的激光雷达观测,计算表明,10～4μ半径的流星微粒是普通金属层的主要影响因素．In this paper, the process of the ablation of meteoroid which radius is less than 100 μm is analyzed by adopting a continuous evaporation model of micro meteoroid, and the impact on the metallic layer in mesosphere （80～110 km） is estimated. The observation of radio meteor radar and Lidar suggests that the ablation of meteoroid which radius is lager than 100 μm is not the major source for metallic layer. From momentum equation and energy equation, the ablation profile of meteoroid with different radius in different velocity is calculated, and the variation of the ablating cut-off height is analyzed. According to the long term observation of lidar, it is concluded that the flux of meteoroid with the radius of 10～40 μm is the major impact of the normal metallic layer. Meteoroids with radius larger than 100μm and average velocity of 12km/s ablate around 80km which is lower than peak of the normal metallic layer. The micro meteoroids with different velocity will result in similar ablation cut-off height if they don＇t ablate completely. Meteoroids with radius of 10～40 μm and injection velocity of 14 km/s ablate mainly at the altitude of 80～110 km and their ablation cut-off heights are also near the underside height of the metallic layers.

关 键 词：流星消融模型 激光雷达 金属层 

分 类 号：P185.82[天文地球—天文学]