Delayed response of the ionosphere to solar EUV variability II (DRIVAR II)

在地球的高层大气中，太阳紫外线和极紫外辐射的吸收导致电离层的产生，电离层随着太阳光谱中这些波长的太阳辐射的变化而变化。然而，由于各种物理和化学过程的相互作用，这些变化之间存在延迟。特别是电离层各层的不同电离和复合过程以及输运过程对延迟有显著影响。这些过程的作用已经在各种研究中进行了调查，但到目前为止，这些分析只研究了延迟的各个方面。DRIVAR II项目将调查迄今为止研究中未包括的延迟方面。这包括高纬度和低纬度延迟的变化或热层和电离层之间耦合过程的作用。基于这些结果和先前的研究，该项目将提供延迟的全局和三维描述。分析将基于已建立的数据集（例如，SDO-EVE、GOES、GUVI、辐射和电离层探空仪数据，或GNSS TEC地图），但也将考虑诸如GOLD和ICON观测等新数据。太阳、热层和电离层参数的变化将使我们能够详细地描述这一延迟。此外，耦合热层电离层等离子体层电动力学（CTIPe）模型和热层-电离层电动力学环流（TIE-GCM）模型将用于更详细的研究，以确定造成延迟的过程。这些调查的结果将被用来提出优化这些模型以及经验模型的建议，如果必要的话。DRIVAR II是位于Neustrelitz的DLR日地物理研究所（DLR- so）和莱比锡气象研究所（LIM）的联合项目。DRIVAR II项目将对电离层和热层过程提供更全面和详细的分析，这些过程定义了电离层的延迟响应。这些研究还将提高对高层大气过程的一般理解，并对预测电离层状况有兴趣。

In Earth’s upper atmosphere, the absorption of solar UV and EUV radiation causes the creation of the ionosphere, which varies following the variations of solar radiation at these wavelengths of the solar spectrum. However, a delay occurs between these variations caused by the interaction of various physical and chemical processes. Especially the different ionization and recombination processes in the layers of the ionosphere but also transport processes have a significant influence on the delay. The role of these processes has been investigated in various studies, but so far these analyses have only studied separate aspects of the delay.The DRIVAR II project will investigate the aspects of the delay that have not been included in studies so far. This includes the variation of the delay at high and low latitudes or the role of coupling processes between thermosphere and ionosphere. Based on these results and previous studies, the project will provide a global and 3-dimensional description of the delay.The analysis will be based on established data sets (e.g., SDO-EVE, GOES, GUVI, radiation and Ionosonde data, or GNSS TEC maps), but will also consider new data such as GOLD and ICON observations. This variety of solar, thermospheric and ionospheric parameters will allow a detailed description of the delay. In addition, the Coupled Thermosphere Ionosphere Plasmasphere Electrodynamics (CTIPe) model and the Thermosphere-Ionosphere Electrodynamics General Circulation (TIE-GCM) model will be used for more detailed studies defining the processes responsible for the delay. The results of these investigations will then be used to make suggestions for optimizing these models as well as empirical models, if necessary.DRIVAR II is a joint project of the DLR Institute for Solar-terrestrial Physics in Neustrelitz (DLR-SO) and the Leipzig Institute for Meteorology (LIM). The DRIVAR II project will provide a more comprehensive and detailed analysis of the ionospheric and thermospheric processes that define the delayed ionospheric response. The studies will also improve the general understanding of processes in the upper atmosphere and are of interest for predicting ionospheric conditions.