流星参数的数值分析和流星高度分布模型

Numerical Analysis of Meteor Parameters and Height Distribution of Meteor

流星余迹能够被后向散射雷达观测到,利用观测结果,可以分析和研究流星的空间分布和时间变化规律.同时,利用流星空间分布还可以进行空间碎片的研究.基于标准理论,对影响雷达回波功率的主要因素,例如如双极扩散、余迹的初始半径、流星的有限速度,以及雷达的脉冲重复频率在不同频率和速度下进行了数值分析和计算,得到的流星衰减时间及双极扩散系数的观测结果与理论结果一致.通过对昆明流星雷达观测到的571 632个流星进行统计分析,得到了流星高度分布统计模型,并利用该模型的分析结果与不同月份流星的观测数据进行对比,结果比较一致.

Based on the meteor radar, one can study the radiant distribution and the time variant of meteors, forecast the passage time of meteor showers, and also investigate space debris, and so on. Based on standard theory, the effects of main factors, such as ambipolar diffusion, the initial trail radius, the finite meteor velocity and the Pulse Repetition Frequency （PRF）, on the radar echoes power at different radar frequencies and meteor velocities have been numerical analysis and calculated. The observation data of meteor decay time and the ambipolar diffusion coefficient are consistent with the theories. By analyzing the 571632 meteors observed by Kunming meteor radar, the height distribution of meteors model has been constructed, the result predicted by this model agrees with observation data at different months.