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ABSTRACT: The oblique sounding data at the Magadan-Irkutsk and Norilsk-Irkutsk paths together with the vertical sounding at stations
located in northeastern Russia were used to analyze ionospheric disturbances in September 2005 and during geophysically active
period in December 2006. It is found that during the main phase of magnetic storms, wave disturbances with a period of 2–4
h are registered. These disturbances cause variations in the layer maximum height up to 40–100 km and in the critical frequency
up to 1.5–2 MHz. Those variations change substantially values of the maximum observed frequencies (MOF) of the ionospheric
radio channel at the paths considered. Such wave disturbances can be caused by generation of AGWs in the auroral zone and
their propagation to equatorial latitudes.
Geomagnetism and Aeronomy 05/2012; 49(8):1249-1253. · 0.95 Impact Factor
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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.
Cosmic Research 04/2012; 46(4):339-346. · 0.39 Impact Factor
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ABSTRACT: This work studies variations of HF characteristics and ionospheric parameters recorded over mid-latitude paths of Russian East-Siberian region during magnetic storms on May 15, 1997, and September 24, 2006. The sharp wave-like changes of maximum observed frequencies (MOF) were recorded during the main phase of investigated storms. Assuming that observed MOF variations can be produced by ionospheric disturbances propagating from the northern to the southern latitudes simulation of HF propagation conditions was carried out.
Ionospheric radio Systems and Techniques, 2009. (IRST 2009). The Institution of Engineering and Technology 11th International Conference on; 05/2009
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06/2000; 443:541.
