Table 1.
Galactic cosmic-ray and SEP tracks in the Metis cosmic-ray matrices. Observations are averaged over 60 s.
| # cosmic-ray matrices | Straight | Slant | Squares | Total | |
|---|---|---|---|---|---|
| May 2020 | 4 | ||||
| GCR Average | 188 | 79 | 4 | 271±22 | |
| May 2022 | 3 | ||||
| GCR Average | 151 | 57 | 4 | 212±6 | |
| February 2023 | 3 | ||||
| GCR Average | 83 | 36 | 1 | 120±5 | |
| July 2023 | 3 | ||||
| GCR Average | 82 | 32 | 1 | 115±4 | |
| February 2024 | 2 | ||||
| GCR Average | 73 | 28 | 1 | 102±3 | |
| SEP July 24, 2023 – 19:00–19:30 UT | |||||
| (Onset – Not available) | |||||
| SEP July 25, 2023 – 03:00–04:00 UT | 2 | ||||
| Peak Average | 4740 | 4892 | 257 | 9889±19 | |
| SEP July 25, 2023 – 15:00–16:00 UT | 2 | ||||
| Decay 1 Average | 787 | 664 | 47 | 1498±6 | |
| SEP July 26, 2023 – 03:00–04:00 UT | 2 | ||||
| Decay 2 Average | 281 | 183 | 9 | 473±11 | |
| SEP July 26, 2023 – 15:00–16:00 UT | 2 | ||||
| Decay 3 Average | 115 | 59 | 2 | 176±9 | |
| SEP February 11, 2024 | 4 | ||||
| Peak 2 Average | 1536 | 884 | 26 | 2446±13 | |
| SEP February 12, 2024 | 4 | ||||
| Near peak 3 Average | 337 | 217 | 10 | 564±13 | |
Notes. Galactic cosmic-ray data from solar minimum in 2020 through solar maximum in 2024 are compared. The uncertainties indicate the variance from the average of the number of tracks in each set of cosmic-ray matrices. Based on availability, between two and four cosmic-ray matrices were analyzed. All observations are normalized to cosmic-ray matrix one-minute exposure time for the GCR comparison with the analysis carried out at solar minimum in 2020. Examples of the track topologies are shown in Fig. 14. The SEP observations also include the GCR contribution.
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