Nonmigrating tidal coupling from the MLT region into the ionosphere and upper thermosphere

在这个项目中，我们打算找出将在中间层/低热层(MLT)区域观察到的非迁移潮汐信号映射到电离层和高层热层的耦合机制，在电离层和高层热层中，这些潮汐的存在被大量确定。随之而来的下一步是确定它们背后的耦合过程。为此，我们利用CHAMP测量，一方面，在纬向风、赤道电喷流(EEJ)和电子密度中显示了显著的波-4结构。另一方面，可以利用基于定时测量的Hough模式扩展(HME)技术和由ROCSAT-1测量得到的垂直等离子体漂移来进行热层的潮汐风场的研究。使用时间-GCM进行的建模研究将被用于桥接未采样区域并测试耦合过程背后的物理原理。此外，它们还有助于解释观测到的潮汐信号的年度变化。

Within this project we intend to find out the coupling mechanisms that map the nonmigrating tidal signals observed in the mesosphere/lower thermosphere (MLT) region into the ionosphere and upper thermosphere, where the presence of these tides was identified in numerous quantities. A consequent next step is to identify the coupling processes behind them. For this we make use of CHAMP measurements, on the one hand, where the prominent wave-4 structure was revealed in the zonal wind, equatorial electrojet (EEJ) and electron density. On the other hand, tidal wind fields of the thermosphere derived from the Hough Mode Extention (HME) technique based on TIMED measurements and vertical plasma drifts derived from ROCSAT-1 measurements are available to conduct the research. Modeling studies performed with the TIME-GCM will be used to bridge the unsampled regions and to test the physics behind the coupling processes. They furthermore shall help explaining the observed annual variations of the tidal signals.