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

Recordings of ELF-VLF waves with the right-hand (RH) and the left-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 first critical frequency of the Earth-io...

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Bibliographic Details
Published in:Annales Geophysicae
Main Authors: Ostapenko, A. A., Titova, E. E., Nickolaenko, A. P., Turunen, T., Manninen, J., Raita, T.
Format: Article in Journal/Newspaper
Language:English
Published: Copernicus Publications 2010
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article
Verlagsveröffentlichung
Northern Finland
Online Access:https://doi.org/10.5194/angeo-28-193-2010
https://noa.gwlb.de/receive/cop_mods_00029370
https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00029325/angeo-28-193-2010.pdf
https://angeo.copernicus.org/articles/28/193/2010/angeo-28-193-2010.pdf
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Summary:Recordings of ELF-VLF waves with the right-hand (RH) and the left-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 first critical frequency of the Earth-ionosphere waveguide (the first transverse resonance) around 1.6–2.3 kHz. The wave had the circular LH polarization at this maximum. To interpret observations, we computed the characteristics of the waveguide modes by using the full wave solution in the night model of the ionosphere. Computations show that the spectral maximum at the first transverse resonance frequency arises from a small absorption of the LH polarized radio wave in the magnetized ionosphere plasma, forming the upper boundary of the Earth-ionosphere waveguide.

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