CEDAR: Nightglow Emissions at Solar Maximum

PIs建议利用天文天空光谱研究太阳活动极大期和第23太阳周期衰退期的地球夜光。这项工作与提高我们对日地相互作用的理解的目标直接相关，正如雪松计划第三阶段议程所概述的那样。根据2000年收集的有限数据，他们已经确定了光谱中可见和近红外区域原子氧的大部分里德伯跃迁。除了777.4和844.6 nm的光谱线外，这些辐射以前没有在夜光中看到过。在两种类型的里德伯跃迁中，三重和五重，五重甚至在实验室中也很少被研究，但它们在天空光谱中往往更强。pi将把三联体和五联体与理论计算进行比较，其目标是(1)使用观测到的强度作为相对强度校准标准，(2)确定辐射捕获导致的三联体变异性。

The PIs propose to use astronomical sky spectra to investigate the terrestrial nightglow under solar maximum conditions, and in the declining phase of solar cycle 23. The work is directly relevant to the goal of improving our understanding of solar-terrestrial interactions, as outlined in the phase III agenda of the CEDAR program. From limited data collected in 2000, they have identified most of the Rydberg transitions from atomic oxygen in the visible and near-infrared regions of the spectrum. Except for the lines at 777.4 and 844.6 nm, these emissions have not previously been seen in the nightglow. Of two types of Rydberg transitions, triplets and quintets, the quintets have been little studied even in the laboratory, yet they tend to be the stronger in the sky spectra. The PIs will compare both triplets and quintets against theoretical calculations, with the goals of (1) using the observed intensities as a relative intensity calibration standard and (2) determining variability in the triplets as a consequence of radiation trapping.