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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
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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