A CEDAR Multi-Institution Research Initiative: Derivation of Upper Atmospheric O and N2 Densities for Spectroscopic Studies of Twilight Optical Emissions

高层大气受到紫外线和X射线的照射 来自太阳的辐射，电离和离解， 电子激发分子和原子。 所得 在早晨可以在地面检测到光发射 黄昏时分，当高层大气仍然 被太阳照射，但对流层不是，所以 明亮的蓝天不再笼罩着暗淡的天空 大气排放。 高层大气的光谱 用现代光谱设备检测到的辐射， 包含的信息足以揭示 大气成分和温度，因此重要的 太阳周期和磁场活动 变化. 对数据的分析涉及与以下方面的比较： 产生的光化学过程的数值模型， 太阳辐射。 Aeronomy社区通过CEDAR规划文件 已经批准了一项暮光光谱观测计划， 提供组成信息。 这个奖是给一个飞行员的 该计划旨在培养这一能力，涉及5所大学 和一家私人公司，实验者使用几种类型的 光谱设备，与理论家一起工作， 合作项目

The upper atmosphere is irradiated by ultraviolet and X radiation from the sun that ionizes and dissociates and electronically excites molecules and atoms. The resulting optical emission can be detected at the ground during the morning and evening twilight periods, when the upper atmosphere is still being irradiated by the sun but the troposphere is not, so the bright blue sky no longer overwhelms the fainter upper atmosphere emissions. The spectrum of the upper atmosphere emissions, as detected with modern spectroscopic equipment, contains more than enough information to reveal the upper atmosphere composition and temperature, and thus the important day to day and seasonal solar cycle and magnetic activity variations. An analysis of the data involves comparisons with numerical models of the photochemical processes resulting from the solar irradiation. The Aeronomy community through the CEDAR planning document have endorsed a program of twilight spectroscopic observations to provide the composition information. This award is for a pilot program to develop this capability, and involves 5 universities and a private company, with experimentalists using several types of spectrographic equipment, working with theoreticians in a cooperative program.