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Features of High-Frequency Radio Wave Propagation on Auroral Paths at Different Geomagnetic Activity

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Abstract

Variations in the parameters of the propagation of decameter waves on two auroral radio paths, Dikson–Pevek (D = 2800 km) and Lovozero–Pevek (D = 4200 km), were studied via oblique ionospheric sounding for two days, one weakly disturbed and one strongly disturbed. The following parameters were analyzed: F2 MOF and Es MOF (the maximum observed frequencies when the signal is reflected from the F2 layer and the Es layer), F2Spread (diffuse reflection), and lateral reflections. The following new results have been obtained: the F2 MOF level for the strongly disturbed day is higher than that for the weakly disturbed day on both paths; however, the F2 MOF values during substorms are either small or absent due to increased absorption. The Es MOF values on the Dikson–Pevek path increase during the period of disturbances. As for the Lovozero–Pevek path, the probability of Es reflections decreases during the disturbed day. The diffusion in the F2 layer on the Dikson–Pevek path is mostly typical for a strongly disturbed period, while that on the Lovozero–Pevek path, conversely, is mostly typical for weakly disturbed conditions. Lateral reflections on the Dikson–Pevek path occur rather rarely. On the Lovozero–Pevek path, there are very few lateral reflections on the weakly disturbed day and no lateral reflections on the strongly disturbed day.

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ACKNOWLEDGMENTS

The author is grateful to D.D. Rogov, the member of the Arctic and Antarctic Research Institute (AARI), St. Petersburg, for providing the OIS data owned by the institute. The author is also thankful for the opportunity to use data on the variations in the magnetic field H component and absorption from Tiksi station on the website of the Roshydromet Arctic and Antarctic Research Institute (AARI) (geophys.aari.ru). The author thanks the members of the Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation, V.N. Shubin and M.G. Deminov, for the permission to use their IRI + GDMF2 model.

Funding

This work was supported by the Russian Foundation for Basic Research, project no. 18-05-00343.

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Authors and Affiliations

  1. St. Petersburg State University of Aerospace Instrumentation (SUAI), 190000, St. Petersburg, Russia

    D. V. Blagoveshchenskii

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  1. D. V. Blagoveshchenskii
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Correspondence to D. V. Blagoveshchenskii.

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Translated by M. Chubarova

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Blagoveshchenskii, D.V. Features of High-Frequency Radio Wave Propagation on Auroral Paths at Different Geomagnetic Activity. Geomagn. Aeron. 60, 335–344 (2020). https://doi.org/10.1134/S0016793220030020

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  • DOI: https://doi.org/10.1134/S0016793220030020

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