Zoom-in plot in the vicinity of the proton bursts. (a) Dynamic energy spectrum measured by EPT’s sunward telescope. (b) Dynamic energy spectrum scaled by energy squared, measured by STEP’s central 9 pixels. This scaling enhances the prominence of higher-energy measurements (e.g., Wimmer-Schweingruber et al. 2021, 2023). (c)–(d) PAD in the solar wind frame of ∼38 keV protons measured by STEP (c) and ∼60 keV protons measured by EPT (d). The color indicates the normalized differential flux, which is normalized to the flux averaged over all available pitch angles for each time bin. Beamed distributions show higher values (yellowish) in the beaming direction and lower values (deep blue) in other directions. Isotropic distributions show values around 1 at all pitch angles. (e) Trace PSD of the magnetic field fluctuations, obtained from wavelet analysis, in units of nT²/Hz. (f)–(h) Magnitude |B|, elevation angle θ_B, and azimuthal angle ϕ_B of the IMF measured in the spacecraft frame. The blue curves in (g)–(h) show the absolute values of the variations in θ_B and ϕ_B, respectively. The vertical dashed lines bound several time intervals with labels at the top, which are analyzed in Fig. 3.