CEDAR: Clustered, Multi-Frequency Studies of the Thermosphere, Exosphere, and Topside Ionosphere

CEDAR：热层、外逸层和上部电离层的集群、多频率研究

• 批准号: 9714666
• 负责人: Robert Kerr
• 金额: $ 22.53万
• 依托单位: Scientific Solutions Incorporated
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-03-15 至 2001-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9714666&HistoricalAwards=false
• 关键词: CEDAR; Clustered; Multi; Frequency; Studies

Investigators continue characterizing the composition and dynamics of the upper thermosphere, exosphere, and topside ionosphere at mid-latitude. The methodology uses optical, infrared, and radar frequency remotes sensing techniques, in close association with radiative transport, photoelectron, neutral atmosphere, and ionospheric modeling. In particular, they hope to improve understanding of ion-neutral coupling in the topside F-region. Experimental and modeling efforts have led to new capabilities in measuring the concentrations of all major neutral and ion species in the topside ionosphere using the clustered instrumentation at the Arecibo Observatory. This project brings the techniques together, producing a comprehensive description of the upper thermosphere and lower exosphere. Scientifically, their focus is (1) the relation between hydrogen abundance in the topside ionosphere and increased methane in the troposphere, (2) the relation between hydrogen abundance and magnetic storms, (3) the effects of charge exchange on neutral hydrogen and oxygen abundances, and (4) the evaluation of new techniques to determine winds and temperatures in the topside ionosphere. During six observational campaigns, investigators measurements are utilizing Fabry-Perot interferometers, photometers, all-sky imagers, and the incoherent scatter radars at Arecibo and Jicamarca.

研究人员继续描述中纬度地区上层热层、外逸层和上层电离层的组成和动力学。该方法使用光学、红外和雷达频率遥感技术，与辐射输运、光电子、中性大气和电离层模型密切相关。特别是，他们希望提高对上部f区离子中性耦合的理解。利用阿雷西博天文台的集束式仪器，实验和建模工作使测量上层电离层中所有主要中性和离子种类浓度的新能力得以实现。该项目将这些技术结合在一起，产生了上层热层和下层外逸层的综合描述。在科学上，他们的重点是：(1)上层电离层氢丰度与对流层甲烷增加的关系；(2)氢丰度与磁暴的关系；(3)电荷交换对中性氢和氧丰度的影响；(4)上层电离层风和温度测定新技术的评价。在六次观测活动中，研究人员利用法布里-珀罗干涉仪、光度计、全天成像仪和阿雷西博和吉马卡的非相干散射雷达进行测量。