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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 28, issue 1
Ann. Geophys., 28, 193–202, 2010
https://doi.org/10.5194/angeo-28-193-2010
© Author(s) 2010. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 28, 193–202, 2010
https://doi.org/10.5194/angeo-28-193-2010
© Author(s) 2010. This work is distributed under
the Creative Commons Attribution 3.0 License.

  20 Jan 2010

20 Jan 2010

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

A. A. Ostapenko1, E. E. Titova1,2, A. P. Nickolaenko3, T. Turunen4, J. Manninen4, and T. Raita4 A. A. Ostapenko et al.
  • 1Polar Geophysical Institute, Kola Scientific Centre of Russian Academy of Sciences, Apatity 184200, Russia
  • 2Space Research Institute, Russian Academy of Sciences, Profsoyuznaya str, 84/32, 117997, Moscow, Russia
  • 3Usikov Institute for Radio-Physics and Electronics, Nat. Acad. of Sciences of the Ukraine, 12, Acad. Proskura street, Kharkov 61085, Ukraine
  • 4Sodankylä Geophysical Observatory, Tähteläntie 62, 99600 Sodankylä, Finland

Abstract. 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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