Abstract
The behavior of the HF signal parameters during magnetic storms and substorms has bee experimentally studied simultaneously on the Kiruna-Kirkenes auroral path, Kiruna-Longyearbyen polar path, and Murmansk-St. Petersburg subauroral path. The first two paths are equipped with the instruments making it possible to measure the values of the signal-to-noise ratio, Doppler frequency shift, and elevation angle. The method of oblique sounding of the ionosphere (OSI) was used on the Murmansk-St. Petersburg path. Two substantial substorms, a moderate storm, and an intense storm occurred during the studied period. Some new regularities have been revealed. On the Kiruna-Kirkenes and Kiruna-Longyearbyen paths, the signalto-noise ratio increased (due to the transition from the F 2 signal reflections to the E s reflections), the elevation angle increased (due to an increase in the ionospheric F 2 layer height and a decrease in the critical frequency), and the Doppler shift increased (due to the variations in ionization and the appearance of ionospheric irregularities during a substorm) when the signal was reflected from the F 2 layer close to the moment of the substorm or storm beginning T 0. It is possible to control the so-called “main effect” in the ionosphere on the Murmansk-St. Petersburg path.
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Original Russian Text © D.V. Blagoveshchensky, A.S. Kalishin, A.J. Stocker, E.M. Warrington, 2009, published in Geomagnetizm i Aeronomiya, 2009, Vol. 49, No. 6, pp. 824–834.
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Blagoveshchensky, D.V., Kalishin, A.S., Stocker, A.J. et al. Propagation of HF radiowaves on high-latitude radio paths during the magnetically disturbed period of October 24–28, 2003. Geomagn. Aeron. 49, 786–796 (2009). https://doi.org/10.1134/S0016793209060127
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DOI: https://doi.org/10.1134/S0016793209060127