Table 1 Year and month of the dusk-side IHFAC suggested by the Fukushima model
Periods | Fukushima model type | Non-Fukushima model type |
|---|---|---|
1999–2001 | December solstice | March–November |
2002–2018 | June/December solstices | March/September equinoxes |
2019 | June solstice | October–April |