CEDAR: Physics of the Hydrogen Geocorona

CEDAR：氢地冕的物理学

• 批准号: 0940270
• 负责人: Edwin Mierkiewicz
• 金额: $ 27.05万
• 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: 2010
• 资助国家: 美国
• 起止时间: 2010-09-15 至 2013-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0940270&HistoricalAwards=false
• 关键词: CEDAR; Physics; Hydrogen; Geocorona

The goal of this project is to obtain empirical estimates of night-time atomic hydrogen (H) density and vertical flux as a function of altitude from the lower thermosphere into the exosphere based on a coupled analysis of measured H airglow intensity and a sophisticated forward model of radiative transport for spectral line profile analysis. Knowledge of these parameters is important for understanding the chemical and dynamical coupling between atmospheric regions. This effort will utilize existing measurements of multi-line H emission at unprecedented precision, acquired from a suite of mature, ground-based, spectroscopic instruments, as well as new data from a novel spectroscopic instrument, which will be tested and deployed as part of this project. Additional goals of this work are to characterize the dependence of the H distribution on geomagnetic and solar variability and to search for signatures of dynamical populations of exospheric H atoms. H density profiles are useful for improving empirical atmospheric models and aiding data interpretation and analysis from other observational research techniques, such as neutral atom imaging.

该项目的目标是，根据对测得的氢气辉强度的耦合分析和用于谱线轮廓分析的复杂辐射传输正演模型，获得夜间氢原子密度和从低热层到外逸层的垂直通量随高度变化的经验估计。 了解这些参数对于了解大气区域之间的化学和动力学耦合非常重要。 这项工作将利用现有的多线H发射测量，以前所未有的精度，从一套成熟的地面光谱仪器中获得，以及从一种新型光谱仪器中获得的新数据，这些仪器将作为该项目的一部分进行测试和部署。 这项工作的其他目标是表征H分布对地磁和太阳变化的依赖性，并寻找外逸层H原子动态种群的签名。 H密度剖面有助于改进经验大气模型，并有助于对中性原子成像等其他观测研究技术的数据进行解释和分析。