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Table 1.
Different classes of variability.
| Factors of variability | Number of classes | |
|---|---|---|
| Ecliptic plane/solar magnetic equator – Sun-Earth relative position | ||
| Seasonal variation | Spring | 4 classes |
| Summer | ||
| Autumn | ||
| Winter | ||
| Toroidal component of the solar magnetic field | ||
| Sunspot variation (radiation UV, EUV) | Rz < 20 → minimum | 4 classes |
| 20 ≤ Rz ≤ 100 → increasing | ||
| Rz > 100 → maximum | ||
| 100 ≥ Rz ≥ 20 → decreasing | ||
| Shock event | Aa indices and SSC | 4 classes |
| Shock activity | Classification by Legrand & Simon (1989) | |
| Richardson et al. (2000) | ||
| Shock related to CME | ||
| 1 class | ||
| Poloidal component of the solar magnetic field | ||
| Quiet magnetic activity | Slow solar wind speed | |
| 1 class | ||
| Geomagnetic activity | High solar wind streams from coronal holes | |
| Recurrent activity | 1 class | |
| Geomagnetic activity | Fluctuating solar wind all other cases | |
| Fluctuating activity | 1 class | |
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