Open Access
Table 2
Occurrence and duration of SWF, AA, PCA, and PSD events overall and for a subset of MOD and SEV events. See the text for additional details.
| Event duration (minutes) |
|||||||
| SWF |
Flare class |
Occurrence |
Occurrence ≥ C |
Min |
Max |
Mean |
Median |
| C | 45,330 | 87.8% | 0 | 728 | 22 | 15 | |
| M | 5840 | 11.3% | 0 | 573 | 43 | 29 | |
| X1 (MOD) | 420 | 0.8% | 3 | 528 | 68 | 48 | |
| X10 (SEV) |
18 |
0.03% |
31 |
464 |
132 |
96 |
|
| Event duration (hours) |
|||||||
| AA |
Kp
|
Occurrence |
Occurrence ≥ 4 |
Min |
Max |
Mean |
Median |
| 4 | 8998 | 64.2% | – | – | – | – | |
| 5 | 3342 | 23.8% | – | – | – | – | |
| 6 | 1133 | 8.1% | – | – | – | – | |
| 7 | 403 | 2.9% | – | – | – | – | |
| 8 (MOD) | 132 | 0.9% | 3 | 15 | 5.1 | 3 | |
| 9 (SEV) |
9 |
0.1% |
6 |
21 |
12.0 |
12 |
|
| Event duration (hours) |
|||||||
| PCA | Absorption (dB) |
Occurrence |
Occurrence ≥ 1 dB |
Min |
Max |
Mean |
Median |
| 1 ≤ A < 2 (MOD) | 27,418 | 53.2% | – | – | – | – | |
| 2 (MOD) ≤ A < 5 (SEV) | 17,490 | 33.9% | 0.25 | 39.42 | 7.85 | 4.92 | |
| A ≥ 5 (SEV) |
6657 |
12.9% |
3.08 |
176.75 |
39.18 |
35.83 |
|
| Event duration (hours) |
|||||||
| PSDs | ΔfoF2 |
Occurrence |
|
Min |
Max |
Mean |
Median |
| −30% ≥ ∆foF2 > −50% (MOD) | 727* | 2 | 96 | 5.47 | 3 | ||
| −50% ≥ ∆foF2 (SEV) | 203* | 2 | 54 | 8.54 | 8 | ||
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