Modeling of the cold electron plasma density for radiation belt physics

This review focusses strictly on existing plasma density models, including ionospheric source empirical physics-based and machine-learning models. is framed in the context of radiation belt physics space weather codes. The limited to most commonly used models or recently developed promising. A great variety conditions considered such as magnetic local time variation, geomagnetic conditions, regions, radial latitudinal dependence, collisional vs. collisionless conditions. These can serve complement satellite observations electron when data are lacking, for them simulations, improve our understanding plasmasphere dynamics.