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Comparison between EPT, SIS and HET data for the 21–23 July 2020 event for the sunward-facing telescopes. The upper panel shows the SIS and HET-B proton intensity together with the EPT ion spectrum in the magnet channel over the nominal H energy range. The filled symbols show the measured spectra after the subtraction of a quiet-time spectrum. This quiet-time spectrum was acquired between 18–20 July and is shown as empty symbols. Error bars are statistical. The noticeable increase of intensity in the quiet-time SIS proton spectrum above a few MeV is due to ACRs. The middle panel adds the quiet-time-corrected SIS spectra for H, 3He, 4He, O, and Fe. The black line up to about 6 MeV represents the sum of the SIS ion species intensities that can be compared to the EPT spectrum in the nominal H energy range as explained in the text. Above 7 MeV we compare the EPT ion spectrum in the nominal He energy range and the sum of heavy ions measured by SIS as a gray solid line. The bottom panel shows the ratio of the sum between the relevant SIS ion spectra and the EPT spectra to allow a better comparison. The gray-shaded area marks the propagated statistical errors.
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