Physics of auroral phenomena : proceedings of the 36th Annual seminar, Apatity, 26 February – 01 March, 2013 / [ed. board: A. G. Yahnin, A. A. Mochalov]. - Апатиты : Издательство Кольского научного центра РАН, 2013. - 215 с. : ил., табл.

S.E. Revunov et al. Test results of the numerical analysis at 20 five-day intervals 2001-2005 was performed. During which Solar flares class M or X were not observed. By the method proposed in the study for all intervals and analyzed undisturbed for each analyze scale of oscillations histogram o f intensity groups moments o f complete synchronization of oscillations recorded on magnetic observatories were calculated. The histograms corresponding to the same scale as summarized and linked to the timeline. As seen in the histogram shown (see Fig. 3) previously detected extremes (see Fig. 1) is not observed, which indirectly confirms the validity of the developed method in the study and allows us to offer following hypothesis. The mechanism of occurrence and further synchronization in large geographical limits may be an increase of the ionospheric conductivity and hence the enhancement of ionospheric current system oscillations by Solar ionizing electromagnetic radiation before extreme flare. Fluctuations in the intensity o f this radiation in geomagnetic pulsations from the periods of the order of an hour or more, which can be associated with the corresponding inertia of the ionosphere [Barkhatov et al., 2004] are shown. An alternative possibility o f a long-period geomagnetic fluctuations may be the impact of the magnetized Solar wind flow changes as a result of oscillatory processes in the Solar atmosphere. To test this hypothesis were made total histogram moments synchronization of oscillations in the parameters of the Solar wind and IMF (Fig. 2). The resulting histograms reflect moments synchronization o f oscillations in the velocity o f the Solar wind, its density and the magnitude of IMF, which are often observed in the oscillations with periods o f about 30 minutes. Indeed, such is the characteristic time scale restructuring o f the oscillatory process in the Solar wind [Kepko and Spence, 2003; Barhatov et al., 2013]. However, histograms do not contain the results previously mentioned extremes, and can not indicate future flare. Thus, according to our study only mechanism o f occurrence and sync of further geomagnetic pulsations in the wide geographic range may be an increase o f the ionospheric conductivity with increasing vibrational ionospheric current systems by solar ionizing electromagnetic radiation before extreme flare. Acknowledgements. We thank N.A. Barkhatov for the statement of the problem and for useful discussions. This work was supported by RFBR grant 12-05-00425 and by the project "Development of modem methods of forecasting the state o f the magnetosphere-ionosphere in order to ensure successful communication on the basis of fundamental research of the influence of Solar activity" institution o f higher education within the executable tasks of the Ministry of Education and Science. References Barhatov NA, Howler monkeys SE, DV Shadrukov Qualifying Solar plasma flows on the analysis of extra- and intermagnetospheric low-frequency pulsations during magnetic storms // Scientific journal, NNGASU, № p, 106-112,2013. Barkhatov N.A., Revunov S.E., Uryadov V.P. (2004), Forecasting of the critical frequency of the ionosphere F2 layer by the method of artificial neural networks. Int. J. Geomagn. Aeron., 5, GI2010, DOI: 10.1029/2004GI000065. Bystrov M.V., Kobrin M.M., Snegiryov S.D. Quasi-periodic fluctuations of the magnetic field of the Earth with periods of 20-200 minutes and their relation to similar fluctuations in the radio emission from the Sun before proton flares // Geomagnetism and Aeronomy, 1979, Vol. 2, p.306. Daubechies I. Ten Lectures on Wavelets. Izhevsk: "Regular and Chaotic Dynamics", 2001,464 p. Kepko L., Spence H.E. Observations of discrete, global magnetospheric oscillations directly driven by solar wind density variations // Journal o f geophysical research, Vol. 108, No. A6, 1257, 2003. Smirnov A. On strengthening the long-period fluctuations of H-component o f the magnetic field of Earth in front of powerful Solar flares // Bulletin of the Nizhny Novgorod University, 2010, № 1, p. 79-95. 58