CEDAR: Physics of the Hydrogen Geocorona

研究人员将获得Balmer α和Balmer β氢发射的高光谱分辨率数据，以确定高层大气中氢的密度分布、通量和有效温度。这项工作的目的是解决长期存在的观测困难，即测量夜空中微弱的日冕发射线。测量结果将通过高灵敏度的法布里-珀罗干涉仪获得，采用精确的方法获得波长和仪器轮廓的精确校准，并校正星系背景辐射和大气传输效应。这些测量将与模型相结合，以更好地了解氢地日冕，它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。

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.