Model studies of hydroxyl airglow under the influence of ionization.

振动激发的羟基分子OH*的发射是陆地中间层动力学和化学过程的有用指示器。OH*对零星电离事件的响应提供了一个有趣的机会来测试我们对这些化学和动力学过程的理解。然而，在电离事件中观察到的OH*发射的微扰很难理解。太阳粒子事件引起了显著的OH~*发射扰动，这还没有被大气模型再现。此外，由活跃雷暴上方的电击穿事件引起的明亮的OH*释放比等离子体化学模拟的预测要强得多。该项目的目的是研究电离对中间层中的OH*的影响。为此，将改进现有的离子和等离子体化学模型，并将其用于详细研究化学过程。特别是，将考虑通过电子放电中振动激发的氮分子来产生OH*的提议。此外，还将研究电离事件引起的温度增强的潜在影响。模型的结果将与卫星观测的OH*排放进行比较。

Emissions of vibrationally excited hydroxyl molecules OH* are useful indicators for dynamical and chemical processes in the terrestrial mesosphere. The response of OH* to sporadic ionization events provides an interesting opportunity to test our understanding of these chemical and dynamical processes. However, the observed perturbations of OH* emissions during ionization events are hardly understood. Solar particle events give rise to pronounced OH* emission disturbances which have not been reproduced by atmospheric models yet. Furthermore, the bright OH* emissions due to electric breakdown events above active thunderstorms are much stronger than the predictions of plasma chemistry simulations. The aim of this project is to investigate the effects of ionization on OH* in the mesosphere. For this purpose, existing ion and plasma chemistry models will be improved and used to study the chemical processes in detail. In particular, the proposed production of OH* through vibrationally excited nitrogen molecules in electric discharges will be considered. Additionally, the potential effect of temperature enhancements due to ionization events will be investigated. The model results will be compared to satellite observations of OH* emissions.