Table 3.
Number of tracks in the cosmic-ray matrices of the Metis VL instrument according to Monte Carlo (MC) simulations and observations during 60-s exposure time by considering primary protons.
| Number of tracks |
||||
|---|---|---|---|---|
| MC | Observed | ϕestimated | ϕreal | |
| ( MV c−1) | ( MV c−1) | |||
| GCRs | ||||
| May 2020 | 276 ± 39 ± 17 | 271 ± 22 | 300 | 299 |
| May 2022 | 242 ± 34 ± 16 | 212 ± 6 | 340 | 433 |
| February 2023 | 118 ± 17 ± 11 | 120 ± 5 | 650 | ? |
| GCRs+SEPs | ||||
| February 25, 2023 | 143 ± 20 ± 12 | 161 ± 5 | ||
Notes. Systematic and statistical uncertainties on the MC results are shown. As expected, a better agreement between particle track observations and MC simulations is found when the solar modulation parameter adopted for the estimate of the proton energy spectra used for the simulations (300 MV c−1) is similar to the observed value (299 MV c−1), as in 2020. The reliability of the solar modulation parameter estimate for February 2023 will be verified when the actual value will be available.
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