Solar-Terrestrial Physics Solar-Terrestrial Physics Solar-Terrestrial Physics 2500-0535 12014 10.12737/19877 Results of current research Results of current research Results of current research North-south asymmetry of geomagnetic activity and solar wind electric field North-south asymmetry of geomagnetic activity and solar wind electric field Макаров Георгий Афанасьевич Makarov Georgy Afanasyevich gmakarov@ikfia.sbras.ru

кандидат физико-математических наук;

candidate of physical and mathematical sciences;

 Институт космофизических исследований и аэрономии им. Ю.Г. Шафера СО РАН Якутск Россия Yu.G. Shafer Institute of Cosmophysical Research and Aeronomy SB RAS Yakutsk Russian Federation 31 05 2016 31 05 2016 2 1 44 49 https://zh-szf.ru/en/nauka/article/12014/view

Geomagnetic activity asymmetry in the Northern and Southern hemispheres is studied. It is shown that the higher is the level of magnetic activity the greater is the asymmetry. It is found that the asymmetry in the hemispheres manifests itself in the 06–18-hour component of magnetic activity diurnal variation, while the asymmetry in the 00–12-hourly component is completely absent. The cause of geomagnetic north-south asymmetry is supposed to be meridional Pedersen current between high and middle latitudes in the ionosphere. A qualitative model of formation of asymmetry connected with the solar wind electric field is proposed.

Geomagnetic activity asymmetry in the Northern and Southern hemispheres is studied. It is shown that the higher is the level of magnetic activity the greater is the asymmetry. It is found that the asymmetry in the hemispheres manifests itself in the 06–18-hour component of magnetic activity diurnal variation, while the asymmetry in the 00–12-hourly component is completely absent. The cause of geomagnetic north-south asymmetry is supposed to be meridional Pedersen current between high and middle latitudes in the ionosphere. A qualitative model of formation of asymmetry connected with the solar wind electric field is proposed.

 Geomagnetic activity Earth’s magnetosphere interplanetary magnetic field Geomagnetic activity Earth’s magnetosphere interplanetary magnetic field

Cao J.B., Duan A., Dunlop M., Wei X., Cai C. Dependence of IMF By penetration into the neutral sheet on IMF Bz and geomagnetic activity. J. Geophys. Res. 2014, vol. 119, pp. 5279-5285. DOI: 10.1002/2014JA019827. Cao J.B., Duan A., Dunlop M., Wei X., Cai C. Dependence of IMF By penetration into the neutral sheet on IMF Bz and geomagnetic activity. J. Geophys. Res. 2014, vol. 119, pp. 5279-5285. DOI: 10.1002/2014JA019827. Danilov A.A. North-south asymmetry of geomagnetic activity. Geomagnetizm i Aeronomiya [Geomagnetism and Aero-nomy]. 1998, vol. 38, no. 3, pp. 39-46 (in Russian). Danilov A.A. North-south asymmetry of geomagnetic activity. Geomagnetizm i Aeronomiya [Geomagnetism and Aero-nomy]. 1998, vol. 38, no. 3, pp. 39-46 (in Russian). Geomagnetic Data. IAGA Bulletin 1972-1976, no. 32, a-h. Geomagnetic Data. IAGA Bulletin 1972-1976, no. 32, a-h. Iijima T., Potemra T.A. The amplitude distribution of field-aligned currents of northern high latitudes observed by Triad. J. Geophys. Res. 1976, vol. 81, pp. 2165-2174. Iijima T., Potemra T.A. The amplitude distribution of field-aligned currents of northern high latitudes observed by Triad. J. Geophys. Res. 1976, vol. 81, pp. 2165-2174. Ionospheric-magnetic disturbances at high latitudes / Ed. O.A. Troshichev. Leningrad: Gidrometeoizdat Publ., 1986. 256 p. (in Russian). Ionospheric-magnetic disturbances at high latitudes / Ed. O.A. Troshichev. Leningrad: Gidrometeoizdat Publ., 1986. 256 p. (in Russian). Petrukovich, A.A. Origins of plasma sheet By. J. Geophys. Res. 2011, vol. 116, A07217. DOI: 10.1029/2010JA016386. Petrukovich, A.A. Origins of plasma sheet By. J. Geophys. Res. 2011, vol. 116, A07217. DOI: 10.1029/2010JA016386. Shelomentsev V.V. Correlation between the north-south asymmetry and IMF y-component. Issledovaniya po Geomagnetizmu, Aeronomii i fizike Solntsa [Research on Geomagnetism, Aeronomy and Solar Physics]. Moscow, Nauka Publ., 1977, iss. 43, pp. 55-59 (in Russian). Shelomentsev V.V. Correlation between the north-south asymmetry and IMF y-component. Issledovaniya po Geomagnetizmu, Aeronomii i fizike Solntsa [Research on Geomagnetism, Aeronomy and Solar Physics]. Moscow, Nauka Publ., 1977, iss. 43, pp. 55-59 (in Russian). Siebert M. Magnetic activity differences between the two hemispheres following the sector structure of the interplanetary magnetic field. J. Geophys. Res. 1968, vol. 73, pp. 3049-3052. Siebert M. Magnetic activity differences between the two hemispheres following the sector structure of the interplanetary magnetic field. J. Geophys. Res. 1968, vol. 73, pp. 3049-3052. Wilcox J.M. Asymmetry in the geomagnetic response to the polarity of the interplanetary magnetic field. J. Geophys. Res. 1968, vol. 73, pp. 6835-6836. Wilcox J.M. Asymmetry in the geomagnetic response to the polarity of the interplanetary magnetic field. J. Geophys. Res. 1968, vol. 73, pp. 6835-6836. Yoshizawa K. Effect of the IMF-By component on the North-South asymmetry of geomagnetic activity. Planetary and Space Sci. 1986, vol. 34, pp. 639-644. DOI: 10.1016/ 0032-0633(86)90041-3. Yoshizawa K. Effect of the IMF-By component on the North-South asymmetry of geomagnetic activity. Planetary and Space Sci. 1986, vol. 34, pp. 639-644. DOI: 10.1016/ 0032-0633(86)90041-3.