Extension of scintillation modeling capabilities with the GISM to polar regions

Kurzfassung

Recently we acquired the Global Ionospheric Scintillation Model (GISM) which is based on the multiple random phase screen method, Vasylyev et al., 2024. Currently this model is capable to cover the low-latitude regions only and our efforts are focused on the model extension to high- and polar latitudes before deploying the model in the operational service. For this purpose, it is planned to use the recently developed method of phase gradient screens that allows to simulate refractive-type of scintillation caused by scattering on strong ionospheric gradients. The climatology of the required gradient field is deduced from the in-situ measurements of electron density onboard of Swarm satellites spanning the period of 10 years of data collection. In this connection, the method of empirical orthogonal functions has been used to relate the gradient values and the relevant driving parameters such as the solar flux index, solar wind coupling parameter, strength of the geomagnetic field, etc. Another source on gradient strength required for simulation comes from the ROTI model developed by Y. Jin et al. 2024.