  We compare of the cross polar cap potential (CPCP) saturation during magnetic
storms induced by various types of the solar wind drivers. By using the model
of Siscoe-Hill
\citep{Hilletal1976,Siscoeetal2002a,Siscoeetal2002b,Siscoeetal2004,Siscoe2011}
we evaluate criteria of the CPCP saturation during the main phases of 257
magnetic storms ($Dst_{min} \le -50$ nT) induced by the following types of the
solar wind streams: magnetic clouds (MC), Ejecta, the compress region Sheath
before MC ($Sh_{MC}$) and before Ejecta ($Sh_{E}$), corotating interaction
regions (CIR) and indeterminate type (IND). Our analysis shows that occurrence
rate of the CPCP saturation is higher for storms induced by ICME ($13.2%$) than
for storms driven by CIR ($3.5%$) or by IND ($3.5%$).The CPCP saturation was
obtained more often for storms initiated by MC ($25%$) than by Ejecta ($2.9%$);
it was obtained for $8.6%$ of magnetic storms induced by sum of MC and Ejecta,
and for $21.5%$ magnetic storms induced by Sheath before them (sum of $Sh_{MC}$
and $Sh_{E}$). These results allow us to conclude that occurrence rate of the
CPCP saturation at the main phase of magnetic storms depends on the type of the
solar wind stream.
