Main characteristics of scaling conditions for frequently used PC index versions.
|Version||Epoch for scaling||Solar activity||Reverse convection||Reference level|
|OMNI||1977–1980||Peak of cycle||Frequent||No QDC, BL only|
|AARI||1998–2001||Peak of cycle||Frequent||BL and QDC*|
|IAGA||1997–2009||Cycle average||Average||BL and QDC**|
|DMI||1997–2009||Cycle average||Excluded||BL and QDC***|
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