CEDAR: Continuation to Daytime Potassium Doppler Lidar at Arecibo

CEDAR：阿雷西博日间钾多普勒激光雷达的延续

• 批准号: 0919786
• 负责人: Xinzhao Chu
• 金额: $ 5.23万
• 依托单位: University of Colorado at Boulder
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-04-15 至 2011-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0919786&HistoricalAwards=false
• 关键词: CEDAR; Continuation; Daytime; Potassium; Doppler

This one-year project aims to complete construction of a daytime potassium Doppler lidar and to test its operation at Arecibo Observatory. The Arecibo lidar, based on a narrowband injection-seeded alexandrite ring laser, has been able to make nighttime temperature and potassium density measurements in the mesosphere and lower thermosphere region since February 2001. Through seven years of operation, the nighttime technology has matured and sufficient data were collected to characterize the nocturnal thermal structure and nocturnal potassium seasonal variations. To enhance its measurement capability and to better serve the aeronomy community, in 2005 a project was proposed and received funding for three years to upgrade the Arecibo lidar to a daytime observing capability and to conduct extensive observations to study the tropical mesosphere and lower thermosphere region over the full-diurnal cycle at the Arecibo Observatory. The lidar modifications have been underway for the past three years but the Faraday filter originally intended to be used did not perform as expected. Many of the other technical goals of the previous project were achieved, such as narrowing of the field-of-view, construction of the Faraday filter test station, implementation of the new receiver optical chopper, initial observational tests, and implementation of new data processing techniques. In addition, the optical elements and hardware necessary to construct a new Faraday filter were acquired. The project will therefore complete the remaining steps to yield a daylight-optimized lidar capable of making full diurnal observations at Arecibo, where its collocation with the incoherent scatter radar will enable a wide variety of scientific studies, such as measurements of tides, gravity waves, absolute atmospheric density, metal layer chemistry, and the evolution of sporadic atom and ion layers.

这个为期一年的项目旨在完成白天的钾多普勒雷达（Doppler LiDar）的建设，并测试其在Arecibo天文台的运行。 The Arecibo lidar, based on a narrowband injection-seeded alexandrite ring laser, has been able to make nighttime temperature and potassium density measurements in the mesosphere and lower thermosphere region since February 2001. Through seven years of operation, the nighttime technology has matured and sufficient data were collected to characterize the nocturnal thermal structure and nocturnal potassium seasonal variations.为了提高其测量能力并更好地为机动社区服务，2005年提出了一个项目并获得了三年的资金，以将Arecibo LiDar升级到白天观察能力，并进行广泛的观察，以研究热带中层层和较低的热层区域，并在全面的全层周期中，在Arecibo观察到全面的周期中。 在过去的三年中，激光雷达的修改一直在进行，但最初打算使用的法拉第过滤器并未按预期执行。 实现了上一个项目的许多其他技术目标，例如缩小视野的缩小，Faraday滤波器测试站的构建，新接收器光学斩波器的实现，初始观测测试以及新数据处理技术的实现。 此外，采集了构建新的法拉第过滤器所需的光学元素和硬件。 The project will therefore complete the remaining steps to yield a daylight-optimized lidar capable of making full diurnal observations at Arecibo, where its collocation with the incoherent scatter radar will enable a wide variety of scientific studies, such as measurements of tides, gravity waves, absolute atmospheric density, metal layer chemistry, and the evolution of sporadic atom and ion layers.