Acquisition of Instrumentation for a Doppler Lidar System

该主要研究仪器奖旨在为马萨诸塞州干草堆天文台现有的瑞利激光雷达系统开发多普勒风能力。这一升级将允许测量30至100公里高度范围内的中性风。该多普勒和瑞利激光雷达系统将解决的科学问题集中在了解地球中间层和低层热层中潮汐波结构和动力学的变化。对高海拔中性风的测量表明，观测到的潮汐运动与太阳通量变化、地磁扰动或平流层变暖无关。因此，引起变率的可能是潮源区或80千米以下的传播介质。Haystack激光雷达系统的多普勒风能力将使这些过程得以研究。升级需要一个敏感的法布里-珀罗干涉仪和一个基于圆对线技术的主探测器。

This Major Research Instrumentation award to develop a Doppler wind capability for an existing Rayleigh lidar system at the Haystack Observatory in Massachusetts. The upgrade will allow measurement of neutral winds in the altitude range between 30 and 100 km. The scientific problems that will be addressed with this Doppler and Rayleigh lidar system are focused on the understanding of the variability of tidal wave structure and dynamics in the Earth's mesosphere and lower thermosphere. Measurements of neutral winds at higher altitudes have shown that the observed tidal motions are not correlated with solar flux variations, geomagnetic perturbations, or stratospheric warmings. Thus, it is possible that the cause of the variability is in the tidal source region or in the propagating medium below 80 km altitude. The Doppler wind capability for the Haystack lidar system will enable these processes to be studied. The upgrade requires a sensitive Fabry-Perot interferometer with a primary detector based on the Circle-to-Line technique.