CEDAR: Post Doc: Signal Processing of O[II] Emission Spectra from Observations

CEDAR：博士后：O[II] 观测发射光谱的信号处理

• 批准号: 0725239
• 负责人: Susan Nossal
• 金额: $ 18.33万
• 依托单位: University of Wisconsin-Madison
• 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: 2007-09-15 至 2010-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0725239&HistoricalAwards=false
• 关键词: CEDAR; Post; Doc; Signal; Processing

This project is to investigate the source of a newly discovered terrestrial airglow feature at 3276 and 3279 angstroms attributed to the [OII] (O+) doublet (2D - 4S) emission. Observations have been and will be made with a new class of highly sensitive interference spectrometer called the Spatial Heterodyne Spectrometer (SHS). The airglow feature of interest, first detected in 1958 but only observed a few times since then, is believed to originate in the F region of the ionosphere, and the project aims to confirm the identification and investigate the emission's possible use as a tracer of ion chemistry and electron density. The dearth of observations is due to the faintness of the feature. The source of the ions is due to either photoelectrons impacting the sunlit upper atmosphere or precipitating electrons. Most recently, these terrestrial [OII] emission lines were inadvertently detected as part of a Galactic [OII] interstellar medium program underway at the University of Wisconsin's Pine Bluff Observatory. The SHS instrument will be used to study the details of the O+ emission at different viewing geometries and over differing geophysical conditions with unprecedented sensitivity, contributing to observational diagnostics of ionospheric constituents. The resulting database will be used to investigate where the [OII ] emission is generated and what are its effects on the ionosphere. Satellite data such as that from TIMED-GUVI will be examined for possible usefulness in interpreting the ground-based data acquired during the project. One of the broader impacts of this research is the development of spectral analysis codes that will be applicable to aeronomy data. Another is the application of a new spectroscopic technique to aeronomy applications as well as providing assistance to Galactic research studies. Outreach activities are planned in which the SHS data will be used for presentations to interest elementary and high school students in atmospheric research.

这个项目是调查一个新发现的3276和3279埃的地球气辉特征的来源，该特征归因于[OII]（O+）双重态（2D - 4S）发射。 观测已经并将与一类新的高灵敏度干涉光谱仪称为空间外差光谱仪（SHS）。 感兴趣的气辉特征于1958年首次发现，但此后仅观察了几次，据信起源于电离层的F区域，该项目旨在确认识别并调查发射可能用作离子化学和电子密度的示踪剂。 观测的缺乏是由于特征的模糊。 离子的来源是由于光电子撞击阳光照射的高层大气或沉淀电子。 最近，这些地球上的[OII]发射线被无意中探测到，作为威斯康星州大学派恩海崖天文台正在进行的银河[OII]星际介质计划的一部分。 SHS仪器将用于以前所未有的灵敏度研究不同观测几何形状和不同地球物理条件下O+发射的细节，有助于电离层成分的观测诊断。 由此产生的数据库将用于调查[OII ]发射产生的位置及其对电离层的影响。 将对TIMED-GUVI等卫星数据进行审查，看其是否有助于解释项目期间获得的地面数据。 这项研究的更广泛的影响之一是制定适用于高空气象数据的光谱分析代码。 另一个是将一种新的光谱技术应用于高空气象学，并为银河系的研究提供帮助。 计划开展一些推广活动，利用SHS数据向对大气研究感兴趣的小学生和高中生进行介绍。