NDLI: Propagation of HF radiowaves on high-latitude radio paths during the magnetically disturbed period of October 24

Content Provider	Springer Nature Link
Author	Blagoveshchensky, D. V. Kalishin, A. S. Stocker, A. J. Warrington, E. M.
Copyright Year	2009
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.
Starting Page	786
Ending Page	796
Page Count	11
File Format	PDF
ISSN	00167932
Journal	Geomagnetism and Aeronomy
Volume Number	49
Issue Number	6
e-ISSN	1555645X
Language	English
Publisher	SP MAIK Nauka/Interperiodica
Publisher Date	2009-12-06
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Geophysics/Geodesy
Content Type	Text
Resource Type	Article
Subject	Geophysics Space and Planetary Science

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