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Telecommunications and Radio Engineering
SJR: 0.203 SNIP: 0.44 CiteScore™: 1

ISSN Imprimer: 0040-2508
ISSN En ligne: 1943-6009

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Telecommunications and Radio Engineering

DOI: 10.1615/TelecomRadEng.v73.i19.40
pages 1745-1762

SPECTRA AND WAVEFORMS OF ELF PULSES IN THE EARTH-IONOSPHERE CAVITY HAVING THE SMALL LOSSES

A. P. Nickolaenko
O.Ya. Usikov Institute for Radio Physics and Electronics, National Academy of Sciences of Ukraine 12, Academician Proskura St., Kharkiv 61085, Ukraine

RÉSUMÉ

There is kind of gap in the literature on the Schumann resonance. The prediction of the phenomenon was made for the Earth-ionosphere cavity with perfectly conducting walls. However, in the modeling of experimentally observed resonance, the ionosphere has a finite conductivity, while the Earth is always considered as a perfectly conducting sphere. The present investigation fills in the blank mentioned. We demonstrate for the first time the spectra and the waveforms of pulsed radio waves propagating in the cavity with negligible losses. The problem is solved in the framework of the exponential vertical profile of the air conductivity characterized by the single scale height. The spectra and waveforms are computed at a set of the source-observer distances. Deviations are demonstrated in the spectra of the idealistic resonator from the real Earth-ionosphere cavity. Pulses in the time domain were computed showing alterations in the propagation velocity caused by the finite conductivity of the ionosphere. The pulse amplitudes were computed at the source antipode and at the source point itself for the round-the-world wave. We demonstrate the gradual widening of the pulses in the course of propagation combined with the reduction of their amplitude. Amplitude of the round-the-world wave reduces to the extent excluding the "auto-triggering" of lightning strokes even in the idealistic cavity model of negligible losses.


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