Sheath and cloud portion of the event as measured in 1-min rates of protons stopping in the third and fifth detector of HET (upper and lower traces, respectively, of the top panel) and electrons stopping in the third and fourth HET detectors (upper and lower traces, respectively, of the second panel). Bottom panel: magnitude and components of the magnetic field. Vertical lines indicate features seen in the particle rates that correspond to changes in the magnetic field. See text for details.