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D.R.E.A.M.: a Dynamic Radiation Environment Assimilation Modelto understand acceleration, transport, and losses in natural and HANE-produced radiation belts We propose an innovative program to develop a next-generation space radiation model using extensive satellite measurements, new theoretical insights, global physics-based magnetospheric models, and the powerful techniques of data assimilation. The next major breakthroughs in scientific understanding of radiation belt processes must come from data assimilation based modeling. We will develop, test, and validate the model using the natural radiation environment to ensure that we can extrapolate it to the poorly observed conditions during the most extreme natural and man-made events. In developing and testing this important predictive capability we answer one of the most tantalizing outstanding questions in space physics: What accelerates electrons to relativistic energies in the Earth's relatively weak magnetic field?
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