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Recordings of ELF-VLF waves with the right-hand (RH) and theleft-hand (LH) circular polarization were made in Northern Finland.Analysis showed a difference between the RH and LH polarized waves.A pronounced maximum of the wave amplitude was observed at the firstcritical frequency of the Earth-ionosphere waveguide (the firsttransverse resonance) around 1.6–2.3 kHz. The wave had thecircular LH polarization at this maximum. To interpret observations,we computed the characteristics of the waveguide modes by using thefull wave solution in the night model of the ionosphere.Computations show that the spectral maximum at the first transverseresonance frequency arises from a small absorption of the LHpolarized radio wave in the magnetized ionosphere plasma, formingthe upper boundary of the Earth-ionosphere waveguide

Characteristics of VLF atmospherics near the resonance frequency of the Earth-ionosphere waveguide 1.6–2.3 kHz by observations in the auroral region