Peculiarities of the geomagnetic field secular variations at the 20th solar activity cycle
The decrease of solar and; correspondingly; geomagnetic activities at the 20th cycle has reflected on the secular variations of the geomagnetic field. On the continental magnetic observatories of the Earth north hemisphere (Europe and North America) the effect was positive and maximal amplitude was observed at the region of geomagnetic and magnetic poles. If the latitudes of the observatories diminishes amplitude of the effect also decreased and was about zero at the latitudes less 45°. At the Asia; the effect was negative and its maximal amplitude was observed at the observatory IRT. The sign of the effect changes at longitudes 60° (observatory KZN) and 150°—180° (observatory CWE; BRW). At the african and south America observatories the effect was not observed. The most probably; it was result of total variations from external and internal sources and the nearness of observatories to the geomagnetic equator. At Earth’s south hemisphere; the most of the observatories are costal or are placed on the is-lands. The effect was not observed at these observatories. Maybe the induction current of ocean flows compensates the external variations. At the Antarctic continent the little amplitude effect was observed at the south magnetic pole region (DRV).
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Kalinin Yu. D.; 1984. Secular geomagnetic variations. Novosibirsk: Nauka; 160 p (in Russian).
Krivodubskiy V. N.; 2016. Two-summit maxima of solar cycles. VIII Scientific conference “Selected issues of astronomy and astrophysics”; Lviv; 17—20 October 2016. P. 25—26 (in Ukrainian).
Obridko V. N.; Golishev S. A.; Levitin A. E.; 2004. Relation between the structure of the large-scale solar magnetic field in the activity cycles and IMF governing geomagnetic activity. Geomagnetizm i aeronomiya; 44(4); 449—452 (in Russian).
Orlov V. P.; Ivchenko M. I.; Bazarzhapov A. D;. Kolomiytseva G. J.; 1968. Secular variations of the geomagnetic field for 1960—1965. Moscow: Publ. IZMIRAN; 68 p. (in Russian).
Orlyuk M.; Marchenko A.; Romenets A.; 2016. Connection of Earth’s seismisity and its secular variation. Visnik Kievskogo natsionalnogo universitetu. Geologia; (4); 50—54 (in Ukrainian).
Orlyuk M. I.; Marchenko A. V.; Romenets A. A.; 2017. Spatial-temporeral changes in the geomagnetic field and seismicity. Geofizicheskiy zhurnal 39(6); 84—105 (in Russian). doi: https://doi.org/10.24028/gzh.0203-3100.v39i6.2017.116371.
Sumaruk T. P.; Sumaruk P. V.; 2009. Reccurent geomagnetic activity and large-scale magnetic field of the Sun. Kosmichna nauka i tekhnologiya; 15(1); 57—62 (in Ukrainian).
Sumaruk Yu. P.; Sumaruk P. V.; 2013. Features of age variations of the geomagnetic field in the northern polar part of the Earth. Geofizicheskiy zhurnal; 35(2); 137—142 (in Ukrainian). doi: https://doi.org/10.24028/gzh.0203-3100.v35i2.2013.111357.
Sumaruk P. V.; Feldstein Ya. I.; Belov B. A.; 1992. Polar electrojet during magnetic storm of 23—24 march 1969. Geofizicheskiy zhurnal 14(3); 79—81 (in Russian).
Feldstein Ya. I.; Livshits M. A.; Valtchuk T. E.; 1979. General magnetic field of the Sun; geomagnetic activity and prognosis of the parameters of the 21th cycle of solar activity. Bulgarian Geophys. J.; 5(1); 67—73. (in Russian).
Shevnin A. D.; Levitin A. E.; Gromova L. I.; Dremuhina L. A.; Kaynara L. N.; 2009. Solar cyclic variation in magnetic elements of Moscow observatory. Geomagnetism i aeronomiya; 49(3); 315—320 (in Russian).
Yanovskiy B. M.; 1978. Geomagnetism. Leningrad: Publ. LGU.; 591 p. (in Russian).
Davis T. N.; Sugiura M.; 1966. Auroral electrojet activity index AE and its universal time variations. J. Geophys. Res.; 21; 785¾803. https://doi.org/10.1029/JZ071i003p00785.
Ryskin G.; 2009. Secular variation of the Earth’s magnetic field: induced by the ocean flow? New Journal of Physics; 11; 1—23. doi: 10.1088/1367-2630/11/6/063015.
Sumaruk Yu. P.; 2001. On external sources of secular variations of the Earth’s magnetic field. Contribution to Geophysics and Geodesy; 31(1); 353—354.
Sumaruk T.; Sumaruk Yu.; 2007. The new index of the geomagnetic activity. Publ. Inst. Geophys Pol. Acad.; SC Monographic volume; 99(398). P. 374¾379.
Sumaruk Yu. P.; Reda J.; 2011. Secular variations of the geomagnetic field and solar activity. Geofizicheskiy zhurnal 33(4); 134—141. https://doi.org/10.24028/gzh.0203-3100.v33i4.2011.116902.
Verbanac G.; Luhr H.; Rother M.; Korte M.; Mandea M.; 2007. Contributions of the external field to the observatory annual means and proposal for their corrections. Earth Planet Space; 59(4); 251—257. https://doi.org/10.1186/BF03353102.
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