Studies Related to the Terrestrial Lower Thermosphere and Ionosphere

与陆地低层热层和电离层相关的研究

• 批准号: 9901101
• 负责人: Tom Slanger
• 金额: $ 29.99万
• 依托单位: SRI International
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-08-15 至 2002-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9901101&HistoricalAwards=false
• 关键词: Studies; Related; Terrestrial; Lower; Thermosphere

This work is a combination of laboratory studies, calculation of infrared parameters for atmospheric NO emitters, and analysis of nightglow sky spectra made by the Keck 10-meter telescope on Mauna Kea, showing features normally associated only with dayglow or aurora. In the laboratory work, the PIs plan to investigate whether the upper state of the O2 metastable states, particularly in high vibrational levels. Two NO metastable states are expected to be copiously generated in aurorae by electron impact, based on recent electron scattering measurements. Because both of these states are infrared-active, they should contribute to infrared emission in auroral and disturbed environments. The PIs plan to calculate the IR radiative parameters for these states. The sky spectra from the Keck telescope are expected to provide new information. Detection of elemental potassium and the atomic oxygen transitions at 7774 A and 8446 A has shown that features normally associated with the dayglow are also observable at night, although with far lower intensities. The PIs plan to determine the temporal variability of these features and to model their intensities in order to clarify their production mechanisms under conditions quite different from those studied until now.

这项工作结合了实验室研究、大气NO发射体的红外参数计算和莫纳克亚山凯克10米望远镜对夜光天空光谱的分析，显示了通常只与日光或极光有关的特征。 在实验室工作中，PI计划调查O2亚稳态的上态，特别是在高振动能级。 根据最近的电子散射测量结果，在极光中，电子碰撞将大量产生两个NO亚稳态。 由于这两种状态都是红外活跃的，它们应该有助于在极光和干扰环境中发射红外线。 PI计划计算这些状态的IR辐射参数。 凯克望远镜的天空光谱有望提供新的信息。 在7774 A和8446 A处对元素钾和原子氧跃迁的探测表明，通常与日光有关的特征在夜间也可以观察到，尽管强度要低得多。 PI计划确定这些特征的时间变化，并对其强度进行建模，以澄清其在与迄今为止研究的条件完全不同的条件下的生产机制。