Millimeter Spectroscopic Studies of the Mesosphere and Lower Thermosphere

该方案提出了一种地基微波方案， 中层和低层的光谱观测 热层 分子种类O3、CO、HDO（氘代水）， 将在中间层（50-90公里）内测量HO 2; NO 将在低热层（90-120公里）内测量。 在 此外，中间层风速（60-85公里）将 通过测量CO和O3的多普勒频移确定 线 中间层/低热层的各种过程 我们将根据这些观察进行研究。 其中包括太阳能 低热层NO的周期、季节和日变化 峰值密度;中层HO 2的季节和日变化， O3、HDO和风;中层CO的季节变化; 中间层中Ox和HOx化学的光化学平衡; 中层水汽中的D/H比。 大约三四- 每年将在基特湾进行为期一天的观测 Peak NRAO设施（北纬30度）。 一个额外的观察 计划每年在莫纳克亚CSO设施（22 oN）进行一次会议 纬度）。 将协调在这些不同地点进行的观察 研究纬度变化，并可能获得NO 在极光活动高峰期进行观测。

This proposal presents a ground-based program of microwave spectroscopic observations of the mesosphere and lower thermosphere. The molecular species O3, CO, HDO (deuterated water), and HO2 will be measured within the mesosphere (50-90 km); and NO will be measured within the lower thermosphere (90-120 km). In addition, mesospheric wind velocities (over 60-85 km) will be determined through measurement of doppler shifts in the CO and O3 lines. A wide variety of processes in the mesosphere/lower thermosphere will be studied with these observations. These include solar cycle, seasonal, and diurnal variations in lower thermospheric NO peak densities; seasonal and diurnal variations in mesospheric HO2, O3, HDO, and winds; the seasonal variation in mesospheric CO; the photochemical balance of Ox and HOx chemistry in the mesosphere; and the D/H ratio within mesospheric water vapor. Roughly three four- day periods of observing will be conducted each year at the Kitt Peak NRAO facility (30N latitude). One additional observing session per year is planned at the Mauna Kea CSO facility (22oN latitude). Observations at these various sites will be coordinated to study latitudinal variations, and possibly to obtain NO observations during periods of high auroral activity.