© Author(s) 2012. This work is distributed
under the Creative Commons Attribution 3.0 License.
Electron radiation belt data assimilation with an ensemble Kalman filter relying on the Salammbô code
ONERA the French Aerospace lab, Toulouse, France
Abstract. In this study we implement a data assimilation tool using a 3-D radiation belt model and an ensemble Kalman filter approach. High time and space reanalysis of the electron radiation belt fluxes is obtained over the time period 5 October to 25 October 1990 by combining sparse observations with the Salammbô 3-D model in an optimal way. The convergence of the ensemble Kalman filter is analyzed carefully. The risk of using a biased physical model is discussed and relative consequences are highlighted. Finally, a validation against CRRES data and major improvements compared to pure physics based model are presented.