next up previous
Next: Wave Amplitude as a Up: Preferred IMF/Solar Wind Conditions Previous: IMF magnitude Bt (Figure

Solar wind speed Vp (Figure 9)

The P2 (4-8 mHz) and P5 (32-64 mHz) events occurred more frequently at high solar wind speeds. This is especially clear for the P5 events. The occurrence rates for the P3 (8-16 mHz) and P4 (16-32 mHz) events maximize when Vp = 400-450 km/s and Vp = 500-550 km/s, respectively, but neither case has a high normalized occurrence rate when the solar wind speed is higher than 550 km/s.

Figure 9. Normalized occurrence rates for $P_2, \ldots , P_5$ events at different solar wind speeds.