P2 (4-8 mHz) events occur more frequently at locations close
to dawn or dusk but not significantly so. The occurrence rate for P3
(8-16 mHz) events, which shows an opposite trend, is low at dawn
and dusk. The P5 events also occur more likely near local noon, and
they have a very low occurrence rate at dusk hours. During dusk
hours, only the P2 events have a normalized occurrence rate higher
than 1. These observations show the same results as in BS1.
Figure 5. Normalized occurrence rates for events at different local times.