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- W2322386976 abstract "The average frequency of the first mode Schumann resonance is ~7.8 Hz. In reality the first mode presents a triplet. If the Earth-ionosphere cavity were horizontally homogeneous, the resonance mode would be degenerated, i.e. the three frequencies would be equal. The day-night ionospheric asymmetry as well as the enhancement associated with the auroral ionization leads to frequency splitting. The splitting is difficult to reveal because of the damping. We calculate the splitting from the diurnal variation of the first mode Schumann resonance (SR) frequency using a simple resonance field model. The magnetic components of SR are supposed to consist of three axially symmetric fields, each of the fields oscillating with a constant frequency. The orthogonal axes of symmetry are fixed in the solar-geographic coordinate system. One of the axes is directed sunward. The other axis is situated on terminal and close to the north geomagnetic pole. The third axis is perpendicular to the two ones. The summary field has rather complex polarization. Its effective frequency is a combination of the triplet frequencies, so it is formed by the solar-geographic coordinates, i.e. the latitude, local time and season. When an observatory rotates together with the Earth, it registers the effective frequency varying with the local time, the variation being different in the H (north-south) and D (east-west) components. Observations at Spitzbergen and at Kola and Kamchatka peninsulas were utilized for calculations of the triplet frequencies. The frequency splitting amounts to first tenths of Hz. Model calculations of diurnal variation of the effective frequency coincide very well with the observation results at pair of observatories. KeywordsSchumann Resonance; Frequency; Triplet; Diurnal Variation; Splitting" @default.
- W2322386976 created "2016-06-24" @default.
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- W2322386976 date "2013-08-29" @default.
- W2322386976 modified "2023-09-27" @default.
- W2322386976 title "Triplet Frequencies in the First Mode Schumann Resonance" @default.
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- W2322386976 doi "https://doi.org/10.18005/jesr0102003" @default.
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