Hydrogen and Temperature in the High-Latitude Thermosphere Near Solstice, with Coupling to Nearby Altitude Regions

提出的研究将有助于提高对中性原子氢的协调行为和极地热层近至温度的理解。它将特别注意这个大气区域和它在高海拔和低海拔的邻近区域之间的几种耦合模式。局部氢浓度将根据氢、氧原子和离子之间的电荷交换平衡条件，结合F峰附近的卫星等离子体观测得出。测量这些高度的离子温度可以很好地估计中性气体的温度。主要用途将是大气探测器(AE)-D和动力探测器(DE)-2卫星在高倾角极地轨道上获得的独特的、仍然非常有用的航空数据集。总的重点将放在夏季和冬季两极热球的氢密度和中性温度的纬向和纵向分布上，以期更坚定地证实该区域两极氢耗竭和有关温度提高的早期迹象。还将进行大量的比较——夏季和冬季高纬度地区的季节差异以及不同太阳活动水平的影响。这些结果将有助于填补可靠的极地观测数据的严重不足，并有助于改进目前的高纬度热层模式。＊＊＊

9312141 Breig The proposed research will lead to an improved understanding of the coordinated behaviors of neutral atomic hydrogen and the temperature in the polar thermosphere near solstice. It will give special attention to several modes of coupling between this atmospheric region and its neighbors at higher and lower altitudes. Local H concentrations are to be derived from the condition of charge-exchange equilibrium between hydrogen and oxygen atoms and ions in conjunction with satellite plasma observations near the F- peak. Measurements of ion temperature at these heights provide good estimates of the neutral gas temperature. Principal use will be made of the unique, and still highly useful, sets of aeronomic data acquired with the Atmosphere Explorer (AE)-D and Dynamics Explorer (DE)-2 satellites, both in high-inclination polar orbits. General emphasis will be given to the latitudinal and longitudinal distributions of H density and neutral temperature through the summer and winter polar thermospheres, seeking a more firm confirmation of earlier indications for a polar hydrogen depletion and a related enhancement in temperature in this region. A multitude of comparisons will also be undertaken - seasonal differences between summer and winter high latitudes and the effect of different levels of solar activity. These results should help fill a serious deficiency of reliable observational polar data, and contribute to refinements in current models of the high latitude thermosphere. ***