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An interpretation of the cross‐phase spectrum of geomagnetic pulsations by the field line resonance theory

The cross‐phase spectrum of the magnetic fields at two closely spaced stations located on the same meridian can be used to determine the field line resonance frequencies in the magnetosphere. The model of two harmonic oscillators previously proposed in the literature to interpret this technique, however, deviates from the traditional field line resonance model and it fails to interpret the cross‐phase spectrum for the Z component. We show that the cross‐phase spectrum can be interpreted by traditional field line resonance theory with consideration of ionospheric effects even in the presense of a continuum of non‐interacting resonating field lines.