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

PI将通过遥感研究位于斯瓦尔巴群岛朗伊尔城的Cusp极光观测站的极地高层大气中的各种干扰。本研究将解决两个航空经济学问题：(1)带电粒子对热层组成和热力学的影响；(2)行星波、潮汐波和重力波对中层大气和低层热层密度和温度的影响。朗伊尔城的独特位置允许监测由极光椭圆形的尖端，LLBL和极地边界的夜间区域以及极帽区域的磁层粒子沉淀引发的高层大气扰动的光学特征。在这些区域中沉淀的粒子的平均能量的巨大差异导致了明显不同高度的光学发射。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式计算所需的输入，以得出不同高度的热层温度和成分密度。最后，所提出的测量可以确定极地大气中低层热层中纬向对称非迁移潮汐效应转换的动力学和化学过程。

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.