The resonance structure of low latitude Pc3 geomagnetic pulsations

The spectral difference in ULF wave amplitude between closely spaced meridional ground stations may be used to measure the eigenfrequency of magnetospheric field lines (Baransky et al., 1985). A more reliable technique based on the crossphase spectrum has been used to identify eigenfrequencies and study the temporal evolution of local field line resonances. Pc3 (22-100 mHz) pulsations recorded with two pairs of low latitude ground stations have been specifically examined

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