Enviar artigo por via de e-mail Investigation of the influence of high-latitude ionospheric current systems on the results of impedance measurement in the Arctic on the example of the Kola Peninsula
- Autores: Lyubchich V.A.1, Shapovalova Y.A.1
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Afiliações:
- Polar Geophysical Institute
- Edição: Volume 88, Nº 3 (2024)
- Páginas: 430-437
- Seção: Physics of Auroral Phenomena
- URL: https://innoscience.ru/0367-6765/article/view/654731
- DOI: https://doi.org/10.31857/S0367676524030129
- EDN: https://elibrary.ru/QLWLTK
- ID: 654731
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Resumo
We investigated the influence of high-latitude ionospheric current systems on the results of impedance measurements on the Kola Peninsula. Model calculations and joint analysis of satellite data and ground magnetometer data have shown the possibility of distortions in the interpretation of geophysical data due to the spatial vicinity of current systems in cases where rocks of the Earth’s crust have high electrical resistance.
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Sobre autores
V. Lyubchich
Polar Geophysical Institute
Autor responsável pela correspondência
Email: lubchich@yandex.ru
Rússia, Murmansk
Yu. Shapovalova
Polar Geophysical Institute
Email: lubchich@yandex.ru
Rússia, Murmansk
Bibliografia
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Fig. 1. Graphs of dependence of the apparent impedance of the medium ρk, calculated through the impedance values: on the horizontal distance to the source r at the resistivity of the Earth's crust ρE = 10000 Ohm-m (a); at the resistivity of the Earth's crust ρE = 1000 Ohm-m (b) (in the graphs a and b the figures indicate curves for the frequency of the electromagnetic field f = 0.1 (1), 0. 5 (2), 1 (3), 5 Hz (4), 5 - a straight line corresponding to the value of resistivity of the Earth's crust) (c); from the frequency of the electromagnetic field f at ρE = 10000 Ohm-m (c); at ρE = 1000 Ohm-m (d) (in the graphs c and d the figures denote curves for the observation point remote from the source at a distance r = 5 (1), 50 (2), 85 km (3), 4 - a straight line corresponding to the value of resistivity of the Earth's crust); from the values of the resistivity of the Earth's crust ρE for the observation point at a distance r = 5 km from the source (e); for the observation point at a distance r = 85 km (f) (in the diagrams e and f the curves for the frequency of the electromagnetic field f = 0. 1 (1), 0.5 (2), 1 Hz (3), 4 - the straight line corresponding to the values of the resistivity of the Earth's crust)
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Fig. 2. Diagrams of geomagnetic data obtained from Iridium satellites under the AMPERE project (obtained from https://ampere.jhuapl.edu): for a quiet day on 18.04.2014 (15 h UT) (a), for a day with increased geomagnetic activity on 20.04.2014 (b); for a quiet day on 19.12.2014 (03 h UT) (c), for a day with increased geomagnetic activity on 22.12.2014 (d). The cross in the diagrams indicates the location of the induction magnetometer in the geophysical observatory of the Lovozero geophysical observation station
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Fig. 3. Plots of the dependence of the apparent impedance of the medium ρk on the frequency of the natural electromagnetic field f, calculated through the impedance values from the data of the induction magnetometer located in the geophysical observatory of the PGI ‘Lovozero’: the plots correspond to the pair of a quiet day 18. 04.04.2014 (curve 1) and the day with increased geomagnetic activity 20.04.2014 (curve 2) for 15 h UT (a); the plots correspond to the pair of quiet day 19.12.2014 (curve 1) and the day with increased geomagnetic activity 22.12.2014 (curve 2) for 3 h UT (b)
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