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|
|Poloidal component of the solar magnetic field|
|Quiet magnetic activity||Slow solar wind speed|
|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|
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.