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This work relates to the field of ultra-low-frequency (ULF) spectroscopy ofnear-Earth plasma. Our attention is focused on the Alfv\'en ionosphericresonator (IAR), the spectrum of which is a series of discrete lines. The aimof the study is to experimentally verify a well-defined theoretical prediction.Within the framework of an idealized resonator model, a hypothesis about therelationship between the frequencies of spectral lines has been formulated. Totest the hypothesis, observations of ULF oscillations at the mid-latitude Mondyobservatory were used. The result of the analysis confirmed the hypothesis thatodd harmonics of the IAR discrete spectrum are observed on the Earth's surface.Key words: electromagnetic oscillations, Alfv\'en waves, ionospheric Alfv\'enresonator, ultra-low-frequency spectroscopy.

Discrete Spectrum of ULF Oscillations of the Ionosphere