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IMF cone angle $\theta_{BX}$(Figure 6)

In Figure 6, each bin is $10\deg$ wide except for low cone angles where there are fewer data points. The P4 (16-32 mHz) and P5 (32-64 mHz) events occur more often when the IMF cone angle $\theta_{BX}$ is low. It is especially clear for the P5 events. The P2 events (4-8 mHz) behave oppositely and occur most often when $\theta_{BX}$ is high. The normalized occurrence rate for P3 appears to be a mixture of the results for higher-frequency and lower-frequency waves.

Figure 6. Normalized occurrence rates for $P_2, \ldots , P_5$ events at different interplanetary magnetic field (IMF) cone angles.