Open Access
Table 1
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*** |
*
QDC: Based on running 30 days quiet samples (Janzhura and Troshichev, 2008).
**
QDC: Running 30 days quiet samples + solar wind sector contribution (Janzhura and Troshichev, 2011).
***
QDC: 40 days solar rotation weighted quiet samples (Stauning, 2011).
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