The cause of these events is as of present unknown, but are assumed to be a natural activity, since the waveform is observed at both locations 106 km apart. Additionally, during this day of high pulsation activity, there are Pi events that extend into the evening. A 6 minute daytime sample is shown in Figure 12 . Note the superposition of both 15 and 200 second period waves, and the nearly constant 4 second time shift between ground arrival of the signal at both stations, again indicating a propagating mode. Summary In Eastern Europe typical pulsation resonances observed.
Future plans exist for stations to be upgraded and data to be available on the Internet.
Future collaboration planned with other groups to increase observational coverage. References Baransky, L. N., Borovkov, Yu. Space Sci, v. 33, p. 1369-1380. The resonant structure of low latitude Pc 3 geomagnetic pulsations, Geophys. Lett., v. 18, p. 2293-2296.