Abstract
The auroral oval is actually a natural coordinate system to which theoretically and practically the events of space geophysics in the ionosphere and magnetosphere are attached. The oval was built according to the International Geophysical Year more than 50 years ago and probably is related to the magnetic pole of the Earth, which has shifted over this time by more than 1500 km. It should be expected that the configuration and position of the auroral oval could also change. The purpose of this paper is to study the possible displacement of the auroral oval for various geomagnetic activity under current conditions of the position of the Earth’s magnetic pole. The article shows the aurora position relative to the magnetic pole at the present time by analyzing direct optical measurements at the stations of the Kola Peninsula (Lovozero) and Northern Scandinavia (Sodankyla, Kiruna).We have used the model of predicting auroral oval NORUSKA (Svalbard 2) for the comparison of experimental and calculated results. Numerical optical observations from the high apogee satellites during modern time also were used for definition of the oval position. To achieve the goal, precision data and a three-dimensional component model of the Earth’s magnetic field of SPbF IZMIRAN were used, taking into account the contribution of magnetic anomalies of the lithosphere in the height range from 80 to 400 km, obtained according to aeromagnetic, marine and aerospace imagery. The paper indicates that the displacement of the auroral oval position follows the displacement of the magnetic pole of the Earth and location of the magnetic anomalies of the lithosphere. These are the first results obtained on a limited number of measurements, and the work should be continued using more significant statistical material on a wide network of optical observation stations.
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We thank the Editor Nadezhda Zolotova and the anonymous reviewers for their careful reading of our manuscript and their many insightful comments and suggestions which helped us to improve the manuscript.
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Kopytenko, Y.A., Chernouss, S.A., Petrova, A.A., Filatov, M.V., Petrishchev, M.S. (2020). The Study of Auroral Oval Position Changes in Terms of Moving of the Earth’s Magnetic Pole. In: Yanovskaya, T., Kosterov, A., Bobrov, N., Divin, A., Saraev, A., Zolotova, N. (eds) Problems of Geocosmos–2018. Springer Proceedings in Earth and Environmental Sciences. Springer, Cham. https://doi.org/10.1007/978-3-030-21788-4_25
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