CEDAR: Physics of the Hydrogen Geocorona

CEDAR：氢地冕的物理学

• 批准号: 0228465
• 负责人: Fred Roesler
• 金额: $ 22.07万
• 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: 2003
• 资助国家: 美国
• 起止时间: 2003-04-01 至 2007-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0228465&HistoricalAwards=false
• 关键词: CEDAR; Physics; Hydrogen; Geocorona

The investigators will acquire high spectral resolution data from Balmer alpha and Balmer beta hydrogen emissions to determine hydrogen density profiles, fluxes, and effective temperatures in the upper atmosphere. The work is aimed at resolving long-standing observational difficulties in measuring the faint geocoronal emission lines in the night sky. The measurements will be obtained with a high-sensitivity Fabry-Perot interferometer, applying precise methods for obtaining accurate calibration of wavelengths and instrumental profiles, and for correcting for galactic background emissions and atmospheric transmission effects. The measurements will be combined with models to achieve a better understanding of the hydrogen geocorona which influences the chemistry of the upper atmosphere and is linked to long-term variations due to global change.

研究人员将从巴尔默α和巴尔默β氢排放中获取高光谱分辨率数据，以确定高层大气中的氢密度分布、通量和有效温度。 这项工作旨在解决测量夜空中微弱地冕发射线方面长期存在的观测困难。 测量结果将通过高灵敏度法布里-珀罗干涉仪获得，应用精确的方法来获得波长和仪器剖面的精确校准，并校正银河背景发射和大气传输效应。 测量结果将与模型相结合，以更好地了解氢地冕，氢地冕影响高层大气的化学成分，并与全球变化引起的长期变化有关。