Variations in Upper Atmospheric Constituents' Density and Thermodynamics in the Polar Cusp and Polar Cap Regions over Longyearbyen, Svalbard

PI将通过遥感研究斯瓦尔巴特朗伊尔城Cusp极光观测站上空极地高层大气的各种扰动。 这项研究将解决两个空气动力学问题：（1）带电粒子对热层组成和热力学的影响，以及（2）行星波、潮汐波和重力波对中层大气和低热层密度和温度的影响。 朗伊尔城的独特位置允许监测高层大气扰动的光学特征，这些扰动是由在极光椭圆的夜间部分的尖点、LLBL和向极边界以及极冠区域沉淀的磁层粒子触发的。 这些区域中沉淀的粒子平均能量的巨大差异导致来自明显不同高度的光发射。 排放的绝对强度将为高层大气扰动的定量评估提供必要的数据库。 这些数据构成了详细的数值极光模型计算所需的输入，以得出不同高度的热层温度和成分密度。 最后，建议的测量可以确定动力学和化学过程，转换的纬向对称的非迁移潮汐在极地中层大气和低热层的影响。

The PI will study, through remote sensing, various disturbances in the polar upper atmosphere over the Cusp Auroral Observatory in Longyearbyen, Svalbard. This research will address two aeronomic problems: (1) the effects of charged particles on thermospheric composition and thermodynamics, and (2) the effects of planetary, tidal and gravity waves on the middle atmosphere and lower thermosphere density and temperature. The unique location of Longyearbyen permits monitoring optical signatures of upper atmospheric disturbances triggered by the magnetospheric particles precipitating in the cusp, LLBL, and poleward boundary of the night sector of the auroral oval, as well as in the polar cap region. Large differences in the average energy of the particles precipitating in these regions lead to optical emissions from distinctly different heights. Absolute intensities of the emissions will provide the necessary database for quantitative assessment of upper atmospheric disturbances. Such data constitute the input needed for detailed numerical auroral model calculations to derive thermospheric temperatures and constituent densities at different heights. Finally, the proposed measurements can determine the dynamical and chemical processes that convert the effects of zonally symmetric non-migrating tides in the polar middle atmosphere and lower thermosphere.