Abstract
Ionospheric disturbances in the equinox periods of 2005–2006 are considered on the basis of the ionosondes of vertical and oblique sounding located in the north-east region of Russia. It is found that the X-ray flares observed in the first half of September 2005 caused an additional increase in the ionization of the lower ionosphere in the daytime, this fact leading to a development of absorption and an increase in the lowest observable frequencies at the Magadan-Irkutsk and Noril’sk-Irkutsk radio paths. Wave-like changes in the maximum observable frequencies and critical frequencies with periods of about 2–2.5 h were detected during the magnetic disturbances. Oscillations of the planetary wave type with periods of 4–5 days were also revealed.
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Original Russian Text © V.I. Kurkin, N.M. Polekh, O.M. Pirog, I.N. Poddel’skii, A.E. Stepanov, 2008, published in Kosmicheskie Issledovaniya, 2008, Vol. 46, No. 4, pp. 348–355.
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Kurkin, V.I., Polekh, N.M., Pirog, O.M. et al. Ionospheric disturbances in the north-east region of Russia according to ionosonde data in the periods of equinoxes. Cosmic Res 46, 339–346 (2008). https://doi.org/10.1134/S0010952508040096
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DOI: https://doi.org/10.1134/S0010952508040096
PACS
- 94.20.Vv