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Reconstruction of the electron pitch angle distribution for the solar particle event on 10 and 11 December 2020 in the energy range from 30 to 50 keV using data from STEP and EPT. Panel on the right: three slices (indicated by 1, 2, and 3) through the pitch-angle distribution measured by STEP (filled circles) and EPT (filled squares) at three different times in the event as indicated by the corresponding labels (1, 2, and 3) in the bottom of the left-hand panel. We can clearly see how the particle intensity changes from a beam-like distribution to a more isotropic one as time progresses.
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