(a) EPT-Sun and (b) EPT-ASun inverse-velocity (c/v) versus time spectrograms of E²J(E, t) on 2022 December 24. (c) IMF (1 minute) magnitude ∣B∣ and components in RTN coordinates. Shading denotes dropout period. (d) Pitch-angle coverage of the four EPT telescopes. (e) PAD of EPT ions in 103.36–203.33 keV (60 s averaged). (f) PAD of EPT ions in 1.03–1.46 MeV (60 s averaged). Two black vertical dotted lines mark the dropout period.