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Table 1.

Energy thresholds of the MEPED proton detector (SEM-2).

Channel Nominal energy range of protons (keV)
P1 30–80
P2 80–250a
P3 250a–800
P4 800–2500
P5 2500–6900
P6 >6900b

We use 250 keV (Yando et al. 2011), as also used by Sandanger et al. (2015). The description of the instrument reports 240 keV (Evans & Greer 2000).


According to simulations by Yando et al. (2011), P6 can measure protons with energy of at least 10 MeV. It is also sensitive to relativistic electrons.

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