Open Access
Table 6.
TID occurrence.
| Solar activity cycle | Total number of observation | Winter |
Summer |
Equinox |
|||
|---|---|---|---|---|---|---|---|
| Sample size | Occurrence | Sample size | Occurrence | Sample size | Occurrence | ||
| 1997–1999 Moderate activity | 647 | 158 | 0.89 | 185 | 0.86 | 304 | 0.79 |
| 2009–2010 Low activity | 604 | 79 | 0.98 | 235 | 0.97 | 290 | 0.98 |
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