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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
*

Keys: normalized occurrence. The actual PSDs occurrence was available for 22 years, which was normalized to 40 years to match the temporal scales used in this paper.

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