The characterization of the Van Allen radiation belts - with their swaths of magnetically trapped, highly energetic charged particles surrounding the Earth - and the study of the physical mechanisms that influence and drive the dynamics of any of such populations, proves critical for the elucidation of the belt internal dynamics as well as to understand societal impact. These environments are heavily influenced by the wider magnetospheric and ionospheric activity; in particular, during geomagnetic storms and substorms, the variability of the belts is crucial for understanding and predicting space weather impacts. For example, the impact of storms on populations in the South Atlantic Anomaly, proves a relevant topic in the estimation of radiation dose affecting spacecraft and humans. A reliable prediction of such transients, which will become crucial as the next solar maximum approaches, starts from a better understanding of acceleration mechanisms of particles from solar flares and CMEs, and analyzing proton energy profiles of as many Solar Energetic Particles (SEP) as possible could shed more light on the aforementioned processes. Moreover, using in situ measurements, together with high energy results (i.e., Neutron Monitors), allows for a direct insight on Ground Level Enhancements (GLEs) by a wide spectral reconstruction, in order to investigate whether such GLEs are just a class of more energetic solar particles, or rather the result of peculiar acceleration processes that could be modeled and, hopefully, predicted on a short time basis. Comparison with existing space weather models and forecasting systems provides an opportunity to identify gaps in current capability, and thus provide a roadmap to include this physics in the next generation of space weather model developments. This session invites any submission concerning the investigation of the energy-dependent dynamics of the coupled radiation belt/magnetosphere/ionosphere environment; in this framework, presentations including data from LEO and non-LEO missions (PAMELA, AMS-02, Van Allen Probes, ARASE, THEMIS, MMS, Cluster, GOES, POES, BARREL, SAMPEX, CSES, etc.), as well as comparison with theory and existing space weather models, are especially encouraged.