ИСТИНА

Two high-intensity magnetic storms (Dst ~-200 nT), occuring in December 2015 and August 2018, were studied. The first storm was driven by a complex heliospheric structure resulting from the interaction of two CMEs. The second begun from the magnetic cloud associated with a weak CME, but during the recovery phase, the magnetosphere was under the influence of high-speed solar wind stream. To investigate non-adiabatic processes during these storms, electron flux density profiles in phase space were constructed for each satellite pass through the outer radiation belt, generated using the TS04 model available at https://rbspgway.jhuapl.edu/. Analysis of the profile dynamics allows us to assess the role of various competing processes, including particle loss and acceleration-transport mechanisms, at different stages of storm development. In addition to adiabatic changes associated with the development of storm current systems, the study identified processes responsible for actual particle losses, such as escape beyond the magnetopause, and local acceleration. It was also shown that high-speed fluxes are a more effective factor influencing electron flux dynamics.