Fast computation of wave-particle interaction diffusion coefficients for electron radiation belt modelling with a dynamic diffusion frame

Wave particle interactions play a major role in the balance of losses and sources in electron radiation belt dynamics. In particular, they can induce a pitch angle scattering leading to precipitations in the loss cone or local accelerations enhancing electron fluxes. However, the current calculation of the resulting pitch angle and energy diffusion terms in ONERAs WAPI code require huge computing times and prevent thus the update in real time of the local diffusion frame in ONERAs Salammbo-Electron code for different space plasma configurations. In the context of the SAFESPACE projet (H2020), we initiated a recast project on WAPI code in order to reduce its computational cost and improve its physical representation by considering time dependent density distributions calculated by BIRA plasma density model and novel plasma wave power distributions from IAP. This talk aims at presenting the new computing strategy adopted in WAPI, associated to the numerically improved version of Salammbô-Electron code (Salammbô finite volume). We will also present simulations of magnetic storms where the sensitivity to the plasma density played a major role in the dynamic of trapped electrons. This project has received funding from the European Union's Horizon 2020 research and innovation programme under grant agreement No 870437.