Research Article
Seasonal, Diurnal, and Solar-Cycle Variations of Electron Density at Two West Africa Equatorial Ionization Anomaly Stations
Table 2
Predominance of March or September equinoctial peak for different solar-cycle phases.
| Solar cycle phases | Solar cycles | Nature of peak predominance | Ouagadougou station | Dakar station | 20 | 21 | 22 | 20 | 21 | 22 |
| Minimum | X | X | X | | | | March/April | | | | X | X | X | September/October |
| Increasing | X | | | | | | March/April | | X | X | X | X | X | September/October |
| Maximum | | | | | | | March/April | X | X | X | X | X | X | September/October |
| Decreasing | X | X | X | | X | X | March/April | | | | X | | |
September/October |
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