Overview of the energetic particle, plasma and magnetic field lines during this event. Top panel: spectrogram of the energetic particles, showing signatures of velocity dispersion. Second panel: anisotropy of energetic particles propagating from and toward the Sun. Panels 3–5: plasma conditions as measured by the Solar Wind Electrons Alphas and Protons (SWEAP) Solar Probe Cup (SPC) (Kasper et al. 2016). Bottom panel: magnetic field in Radial, Tangential, Normal (RTN) coordinates (Fränz & Harper 2002), as measured by the FIELDS instrument (Bale et al. 2016). On January 20, we see B_R change from positive to negative and B_T change from negative to positive, consistent with crossing the heliospheric current sheet. Estimated CME arrival and departure times are shown on the plot, bracketing a low plasma beta period, which is consistent with the passage of a magnetic cloud. Data are averaged into 15-min intervals.