IMF magnitude B_t (Figure 8)

Wider bins are used in the regions of very weak and very strong IMF in order to obtain better statistics. It is clear that the P₅ (32-64 mHz) events strongly favor a small range of IMF magnitudes centered at approximately 6nT ($\log B_t \simeq 0.78$). The P₄ (16-32 mHz) events occur much more frequently when the IMF is weaker than 5nT ($\log B_T \leq 0.7$). For the P₃ (8-16 mHz) events, the IMF control is not clear except the high occurrence rate at the weakest B_t bin (B_t < 2.5 nT). The P₂ (4-8 mHz) events occur more frequently when the IMF is strong.

Figure 8. Normalized occurrence rates for $P_2, \ldots , P_5$ events at different IMF magnitudes.