In this project, we will combine the experience of GFZ Potsdam, TU Braunschweig, and Institute of Atmospheric Physics IAP, Prague, Czechia to address a number of the most compelling science questions (Q1-7 below) related to the dropouts of fluxes during storms. There are two potential mechanisms of loss 1) Electromagnetic ion cyclotron (EMIC) wave scattering suggested by Kennel and Thorne (1971) and 2) The outward radial diffusion driven by the loss to the magnetopause proposed by Shprits et al. (2016). To quantify the 1st mechanism, we need to develop the models of EMIC waves and answer Q1-2 and Q4. To quantify the dropouts in the radiation belt (RB), we need, first of all, to determine and model the magnetopause location (MP) and answer the Q4. With the known MP location, we can create a new model of EMIC waves based on the magnetopause location and answer the science question in Q4. The developed parameterizations of waves and the MP location will be then included in the VERB code, which will allow us to answer Q5 and Q6. Comparison of the results of simulations with observations would allow us to address the question Q7.