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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 22, issue 4
Ann. Geophys., 22, 1203–1211, 2004
https://doi.org/10.5194/angeo-22-1203-2004
© Author(s) 2004. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 22, 1203–1211, 2004
https://doi.org/10.5194/angeo-22-1203-2004
© Author(s) 2004. This work is distributed under
the Creative Commons Attribution 3.0 License.

  02 Apr 2004

02 Apr 2004

On the new modes of planetary-scale electromagnetic waves in the ionosphere

G. D. Aburjania1, K. Z. Chargazia1, G. V. Jandieri2, A. G. Khantadze3, and O. A. Kharshiladze4 G. D. Aburjania et al.
  • 1I. Vekua Institute of Applied Mathematics, Laboratory of Investigation of Extraordinary Phenomena, Tbilisi State University, University Str., 2, 0143 Tbilisi, Georgia
  • 2Georgian Technical University, Department of Physics, Kostava Str., 77, 0175 Tbilisi, Georgia
  • 3Chair of Meteorology and Hydrology, Tbilisi State University, Chavchavadze Ave., 1, 0175 Tbilisi, Georgia
  • 4Tbilisi State University, Faculty of Physics, Chavchavadze Ave., 3, 0128 Tbilisi, Georgia

Abstract. Using an analogy method the frequencies of new modes of the electromagnetic planetary-scale waves (with a wavelength of 103 km or more), having a weather forming nature, are found at different ionospheric altitudes. This method gives the possibility to determine spectra of ionospheric electromagnetic perturbations directly from the dynamic equations without solving the general dispersion equation. It is shown that the permanently acting factor-latitude variation of the geomagnetic field generates fast and slow weakly damping planetary electromagnetic waves in both the E- and F-layers of the ionosphere. The waves propagate eastward and westward along the parallels. The fast waves have phase velocities (1–5)km s–1 and frequencies (10–1–10–4), and the slow waves propagate with velocities of the local winds with frequencies (10–4–10–6)s–1 and are generated in the E-region of the ionosphere. Fast waves having phase velocities (10-1500)km s–1 and frequencies (1–10–3)s–1 are generated in the F-region of the ionosphere. The waves generate the geomagnetic pulsations of the order of one hundred nanoTesla by magnitude. The properties and parameters of the theoretically studied electromagnetic waves agree with those of large-scale ultra-low frequency perturbations observed experimentally in the ionosphere.

Key words. Ionosphere (ionospheric disturbances; waves propagation; ionosphere atmosphere interactions)

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