CEDAR: Investigations of Sporadic E Layers and Quasiperiodic Echo Structure in Puerto Rico Using Arecibo and a Coherent Scatter Radar

CEDAR：使用阿雷西博和相干散射雷达对波多黎各的零星 E 层和准周期回波结构进行调查

• 批准号: 0003168
• 负责人: Miguel Larsen
• 金额: $ 20.21万
• 依托单位: Clemson University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-03-15 至 2005-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0003168&HistoricalAwards=false
• 关键词: CEDAR; Investigations; Sporadic; Layers; Quasiperiodic

The investigators will study quasi-periodic (QP) echoes associated with sporadic E layers using the Arecibo Observatory incoherent scatter radar, a high frequency (HF) coherent scatter radar to be located on St. Croix, and the Arecibo sodium lidar. Sporadic E and the QP echoes are the result of complex neutral atmosphere/ionization interactions in the mesosphere and lower thermosphere. The goals are (1) to determine the horizontal spatial structure of the ionization and the relationship between that structure and the location of QP echoes observed with the coherent radar, (2) to determine the vertical spatial extent of the ionization structures, and (3) to determine the relationship between the motion of the ionization structures and the Doppler velocities and range rates measured by the coherent scatter radar. To accomplish this, dual-beam azimuth scans will be carried out with the incoherent scatter radar to provide information about the horizontal spatial variations and the vertical extent of the electron density structure and to determine the velocity at which the structures move from one beam to the other. The coherent scatter high frequency radar will be set up in a location on St. Croix so that the beam will be perpendicular to the magnetic field lines in the E region above the Arecibo Observatory so that the two radar have a common volume in the E region. The sodium lidar will be operated in dual-beam mode as well in order to provide information about the horizontal and vertical spatial structure in the lower E region and the motions of the neutral atmosphere. By combining the various measurements, the dataset can be used as a test of the various theories that have been proposed to explain the initiation of the QP echoes.

研究人员将使用Arecibo天文台不一致的散射雷达，与零星E层相关的准周期（QP）回声，高频（HF）相干散点雷达位于圣克鲁瓦和Arecibo钠激光镜头上。 零星E和QP回波是中层和较低热层中复杂的中性气氛/电离相互作用的结果。 目标是（1）确定电离的水平空间结构以及该结构与QP位置之间的关系与相干雷达观察到的QP回声，（2）确定电离结构的垂直空间范围，3（3） ）确定电离结构的运动与多普勒速度和通过相干散点雷达测量的范围速率之间的关系。 为此，将使用不连贯的散点雷达进行双光束方位角扫描，以提供有关水平空间变化和电子密度结构的垂直范围的信息，并确定结构从一个梁移到一个梁到达的速度其他。 连贯的散射高频雷达将在圣克鲁瓦的一个位置设置，以使光束垂直于Arecibo天文台上方的E区域的磁场线，以便两个雷达在E区中具有共同体积。 钠激光钠也将在双光束模式下进行操作，以便提供有关下部E区域中水平和垂直空间结构以及中性气氛的运动的信息。 通过组合各种测量值，数据集可以用作解释QP回声启动的各种理论的测试。