Abstract
AbstractInterference of an incident and reflected Alfvén pulses propagating inside the ionospheric Alfvén resonator (IAR) is studied on the basis of a simple one‐dimensional model. Particular emphasis has been placed on the analysis of spectral features of ultralow frequency (∼1–15 Hz) electric perturbations recently observed by Communications/Navigation Outage Forecasting System satellite. This “fingerprint” multiband spectral structure was observed when satellite descended in the terminator vicinity. Among factors affecting spectral structure the satellite position and distance from the IAR boundaries are most significant. It is concluded that the observed spectrograms exhibit modulation with “period” depending on propagation delay time of reflected Alfvén pulses in such a way that this effect can mask a spectral resonance structure resulted from excitation of IAR eigenmodes. The proposed interference effect is capable to produce a spectral pattern resembling a fingerprint which is compatible with the satellite observations.
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