CEDAR: Remote Oxygen Sensing by Ionospheric Excitation (ROSIE)

CEDAR：通过电离层激发进行远程氧气传感 (ROSIE)

• 批准号: 0737713
• 负责人: Konstantinos Kalogerakis
• 金额: $ 15.92万
• 依托单位: SRI International
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-12-15 至 2010-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0737713&HistoricalAwards=false
• 关键词: CEDAR; Remote; Oxygen; Sensing; Ionospheric

The main objective of this project is to analyze and model observations of the 630-nmatomic oxygen red line emission from ionospheric modification (IM) experiments and to extract the corresponding local O-atom densities. In contrast to the common practice of ignoring oxygen atoms in interpreting such observations in the past, recent experimental studies on the relaxation of O(1D) by O(3P) have revealed the dominant role oxygen atoms play in controlling the lifetime of O(1D) at altitudes relevant to IM experiments. Using the most up-to-date rate coefficients for collisional relaxation of O(1D) by O, N2, and O2, it is now possible to analyze reliably the red line decays observed in IM experiments and thus probe the local O-atom density in the ionosphere. This project will take advantage of an innovative approach to remotely probe O-atoms at the altitudes relevant to IM experiments, to test the current models for O-atom density in the ionosphere, and to study its temporal, seasonal, altitude and spatial variation in the vicinity of heating facilities. Relevant data sets will be acquired from IM sites, with emphasis on data from HAARP and EISCAT, in order to determine the O-atom densities implied from the decays and to make comparisons with standard atmospheric composition models such as MSIS and Jacchia. The results will likely be of use in planning new IM experiments, and the ultimate goal is to generate ionospheric O-atom maps over a particular site, to be compared to models. Remote sensing of O-atom densities and monitoring of their fluctuations in the ionosphere has been a particularly challenging problem. The broader impacts of the project include international collaborative efforts between Tromso University, Norway, Lancaster University, U.K., the Air Force Research Laboratory, and SRI International, and the contribution to the training and research experiences of summer undergraduate students at SRI.

本项目的主要目的是对电离层修饰（IM）实验的630原子氧红线发射观测数据进行分析和建模，并提取相应的局部o原子密度。与过去在解释这类观测结果时忽略氧原子的常见做法相反，最近关于O（3P）对O（1D）的弛豫的实验研究揭示了氧原子在与IM实验相关的海拔上控制O（1D）寿命的主要作用。利用O、N2和O2对O（1D）的碰撞弛豫的最新速率系数，现在可以可靠地分析在IM实验中观察到的红线衰减，从而探测电离层中的局部O原子密度。该项目将利用一种创新的方法，在与IM实验相关的高度上远程探测o原子，测试电离层中o原子密度的现有模型，并研究其在加热设施附近的时间、季节、高度和空间变化。将从IM站点获取相关数据集，重点是HAARP和EISCAT的数据，以便确定从衰变中隐含的o原子密度，并与MSIS和Jacchia等标准大气成分模型进行比较。结果可能会用于规划新的IM实验，最终目标是在特定地点生成电离层o原子图，与模型进行比较。对o原子密度进行遥感并监测其在电离层中的波动是一个特别具有挑战性的问题。该项目的更广泛影响包括挪威特罗姆瑟大学、英国兰开斯特大学、空军研究实验室和SRI国际之间的国际合作努力，以及对SRI夏季本科生的培训和研究经验的贡献。