上层大气中石质流星尾迹的紫外光谱模拟  

Simulation of UV Spectra from the Wake of a Stony Meteor in the Upper Atmosphere

作　　者：张大威[1] 陈波[1] 

机构地区：[1]中国科学院长春光学精密机械与物理研究所

出　　处：《光谱学与光谱分析》2005年第11期1899-1902,共4页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金(60223003);中国科学院长春光学精密机械与物理研究所二期创新基金(200102)资助项目

摘　　要：利用Sparrow的粒子碰撞理论,计算了海拔100～90 km范围内的大气中的不同初始地心坐标速度的石质流星的有效温度;分别采取不同的成分配比,给出了速度72 km·s-1的石质流星尾迹主要成分的粒子数密度;应用大型光谱合成程序Cloudy模拟了上述流星尾迹的240～400 nm波段紫外辐射,给出了若干预期的强谱线的相对强度;经比较发现,有效温度5 680 K、蒸汽分压0.1 Pa的尾迹光谱比较接近观测结果.For stony meteors thrusting through a region with an altitude between 100-90 km in the upper atmosphere at different initial geocentric velocities, the effective temperatures are calculated based on.Sparrow＇s particle-collision theory. Assuming different mixture ratios, particle number densities of certain dominant components that might exist in the wake of a stony meteor at a velocity of 72 km·s^-1 are given. Using a large-scale spectral synthesis code called Cloudy, UV radiation within the 240-400 nm band of the wake of such a meteor is simulated, and relative intensities of several expected strong emission lines are predicted. Comparison shows that our prediction of the spectrum of a meteor wake, which has an effective temperature of 5680 K and a fractional vapor pressure of 0.1 Pa, is fairly close to the observational results.

关 键 词：石质流星 流星尾迹 发射光谱 Cloudy程序 

分 类 号：O53[理学—等离子体物理] O56[理学—物理]