Collaborative Research: High-Time-Resolution Resonance Lidar Detection of Meteor Trails

通过对流星尾迹的激光雷达观测，量化了流星在中层上层和热层下层的金属沉积，并探讨了定量的大气沉积与长寿命金属层之间的关系。所需的观测是通过升级阿雷西博天文台的共振激光雷达系统来完成的。首先对现有的钾共振激光雷达系统进行了改进，对每个激光雷达回波脉冲进行采样，将波束内的时间分辨率提高到35ms，将中间层上层的高度分辨率提高到150m。在升级之后，包括实时信号处理算法的开发和应用，铁、钙、钙和钠激光雷达系统也进行了升级。流星尾金属与零星层中金属含量的比率被用来增进我们对导致大气区域金属分层的动态和化学过程的了解。流星尾迹金属沉积率也被用来计算全球范围内对大气的直接金属沉积。

Metallic deposition by meteor ablation in the upper mesosphere and lower thermosphere is quantified by lidar observations of meteor trails, and the relationship between the quantified meteoric deposition and long-lifetime metallic layers is explored. The required observations are accomplished with upgraded resonant lidar systems at the Arecibo Observatory. The extant potassium resonant lidar system is first modified to sample every lidar return pulse, improving temporal resolution within the beam to 35 ms and altitude resolution to 150 m in the upper mesosphere. Following that upgrade, including development and application of real-time signal processing algorithms, the Fe, Ca, Ca+, and Na lidar systems are also upgraded. The ratios of meteor tail metals to metallic content in sporadic layers is used to improve our understanding of the dynamic and chemical processes that lead to metallic layering in the atmospheric region. The meteor trail metallic deposition rate is also used to calculate direct metallic deposition to the atmosphere on a global scale.