Constellation of selected spacecraft and high-energy proton observation of the GSEP event. Left: blue, pink, red, and green circles mark the heliocentric Earth ecliptic (HEE) location of Solar Orbiter (SO), Parker Solar Probe (PSP), STEREO-A (A), and Earth, respectively, on 2020 November 24 at 12:30 UT. The arrow indicates the estimated longitude of the CME source. Nominal Parker spiral IMF lines assuming a 350 km s⁻¹ solar wind speed are shown. Right: Solar Orbiter EPD/HET 1 h omnidirectional proton intensity, obtained by averaging the intensities of the four telescopes. The curve with blue squares, marked 10 MeV, is a combination of 11 energy bins between 7.0 and 11.3 MeV, and the curve with red triangles, marked 50 MeV, is a combination of 13 energy bins between 27.2 MeV and 75.1 MeV. The vertical dashed line indicates the first appearance of the CME in the STEREO-A/COR2 coronagraph.