Fig. 2: Observations and simulation results of relativistic and ultra-relativistic electrons during the April 2017 geomagnetic storm.
From: Low-density plasma as a key catalyst for electron acceleration in the Van Allen radiation belts
a RBSP-A&B MagEIS observations of electron flux at 0.9 MeV and 54° equatorial pitch-angle. b Simulated electron flux at 0.9 MeV and 54° equatorial pitch-angle using diffusion coefficients calculated for the empirical density model. c Simulated electron flux at 0.9 MeV and 54° equatorial pitch-angle using diffusion coefficients calculated using density measured by RBSP-A&B. d Kp index derived from ground observations and showing the level of geomagnetic activity throughout the storm. e–h, Same as (a–d) but for 4.2 MeV electron flux. Observations of 4.2 MeV electrons are provided by the REPT instrument.
