In situ measurements near Earth, including (a) proton intensity at 9.0–21.0 MeV by LND, (b) proton intensity at 4.3–7.8 MeV by SOHO/EPHIN, (c) ion intensity in 1.05–4.75 MeV by LEMS120 of ACE/EPAM, (d) electron intensity in 40.5 keV–180 keV by Wind/3DP, (e) magnetic field magnitude and three components in the GSE coordinates, (f) solar wind velocity and plasma density from OMNI. The red line indicates the eruption time of solar flare on May 6. The radial direction of the active region as well as the nominal Parker spirals for Earth and STA are plotted in the HEEQ coordinate in the bottom left panel. The pitch angle distribution of electrons measured by Wind after 05:00:00 on May 6 is given in the bottom right panel. Electrons are flowing outwards toward the observer at 180 degrees.