Ionosphere state and parameter estimation using the Ensemble Square Root Filter and the global three-dimensional first-principle model

One of the objectives of the current research was assessing the performance of the upper atmosphere state and parameter ensemble estimation technique in the framework of the Observational System Simulation Experiment (OSSE).

The other purpose was to improve calculation accuracy for the major driving forces in the ionosphere and to increase modeling reliability in real-data operational cases. In the current paper we describe the setup of the modeling system used to obtain the presented results. In the first section we introduce the background physics-based model used in the simulations and discuss its main assumptions along with E → × B → drift and the neutral wind velocity calculation algorithms.