Overview of SEP events 1 (left) and 2 (right). The top horizontal bars show the in situ magnetic field polarity, with red (blue) indicating a magnetic field direction outwards from (inwards towards) the Sun. Panels a: Omnidirectional proton dynamic spectra measured by EPT and HET. The colour-coded bins represent scaled intensity I ⋅ E² in units of cm⁻² s⁻¹ sr⁻¹ MeV. Panels b: First-order anisotropy of protons. Panels c: Pitch angle distribution (PAD) of 12.1 MeV protons measured by the four HET telescopes. Panels d: PAD of 39.5 MeV protons. Panels e: PAD of > 70 eV suprathermal electrons measured by SWA/EAS. Panels f: Magnetic field strength in RTN coordinates. Panels g: Azimuthal and elevation angles of the magnetic field. Panels h: Proton number density and bulk solar wind speed. Panels i: Plasma beta and proton temperature. Panels j: Normalized reduced magnetic helicity, with white contours indicating regions where |σ_m|> 0.6. The vertical dashed lines mark the locations of interplanetary shocks, and the grey-shaded area denotes the intervals of the SFRs.