Identifying the Energization and Loss Processes of Relativistic Electrons with Multipoint Observations and Simulations

English Abstract:

The relativistic electron populations in the Earth’s radiation belts are highly dynamic during geomagnetically active periods. Their variations are controlled by the balance of energization and loss processes. It is a challenge to untangle the relative contributions from different mechanisms. With multipoint measurements and comprehensive radiation-belt models available recently, it becomes possible to identify the responsible processes for the observable changes. In this paper, we study a few relativistic-electron events using particle and field data from the Van Allen Probes, THEMIS and geostationary missions. We will also simulate the events with our Comprehensive Inner Magnetosphere-Ionosphere (CIMI) model. By combining data analysis and simulation methods, we seek to identify the major energization and loss mechanisms of relativistic electrons and determine how their roles change with different solar wind conditions.