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

这个项目是为了研究新发现的3276和3279埃的地面气辉特征的来源，这是由[OII] （O+）双重态（2D - 4S）发射引起的。观测已经并将使用一种新型的高灵敏度干涉光谱仪——空间外差光谱仪（SHS）。感兴趣的气辉特征于1958年首次被发现，但此后只观测了几次，据信起源于电离层的F区，该项目旨在确认识别并研究发射作为离子化学和电子密度示踪剂的可能用途。观测资料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上层大气或沉淀电子。最近，威斯康星大学派恩布拉夫天文台（Pine Bluff Observatory）正在进行的银河星际介质项目（Galactic interstellar medium program）无意中发现了这些地球（OII）发射线。SHS仪器将以前所未有的灵敏度在不同的观测几何形状和不同的地球物理条件下研究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研究[OII]的发射是在哪里产生的，以及它对电离层的影响。将审查诸如来自TIMED-GUVI的卫星数据，以便在解释项目期间获得的地面数据方面可能有用。这项研究的一个更广泛的影响是频谱分析代码的发展，将适用于航空数据。另一个是将新的光谱技术应用于航空应用以及为银河研究提供援助。计划开展外联活动，其中将利用SHS数据进行介绍，使小学生和中学生对大气研究感兴趣。

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.