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Table 7.
Seasonal occurrence of TIDs, propagating in waveguide (WGM) and free-wave mode (FWM).
| Solar activity cycle | Total sample size for the period | Winter |
Summer |
Equinox |
|||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| WGM | FWM | FWM/WGM | Sample size | WGM | FWM | FWM/WGM | Sample size | WGM | FWM | FWM/WGM | Sample size | ||
| 1997–1999 Moderate solar activity | 351 | 0.05 | 0.95 | 17.5 | 74 | 0.18 | 0.74 | 2.8 | 115 | 0.18 | 0.81 | 4.6 | 162 |
| 2009–2010 Low solar activity | 185 | 0.21 | 0.79 | 3.7 | 42 | 0.9 | 0.1 | 0.1 | 20 | 0.26 | 0.74 | 2.8 | 123 |
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