Physics of auroral phenomena : proceedings of the 33rd Annual seminar, Apatity, 02 - 05 March, 2010 / [ed.: A.G. Yahnin, A. A. Mochalov]. - Апатиты : Издательство Кольского научного центра РАН, 2011. - 206 с. : ил.

О.M. Barkhatova, S.E. Revunov magnetopause connected with IMF Bz component and accordingly with transfer o f magnetic streams from a Solar wind to magnetosphere. 3. It is necessary to note that values of statistical weights for Solar wind density and velocity concerning eastward and westward electrojets are various. Solar wind density has the greater influence on eastward electrojet while Solar wind velocity has the greater influence on westward electrojet. It can be caused by different nature of auroral electrojets - westward electrojet is connected to explosive processes o f substorm (rapid transfer of IMF Bz component from Solar wind to magnetosphere), and eastward electrojet is caused by stationary magnetospheric convection. 4. As expected the strongest agent determining the intensity of ring current symmetric and asymmetric parts is IMF Bz component. It means that dynamics of Bz component directly drive a ring current behaviour. 5. Solar wind density and velocity have no clear influence on a ring current. Perhaps it’s due to ring current contents up to 80 % ionospheric ions during magnetic storm main phase. Conclusion In current work the influence o f Solar wind and Interplanetary Magnetic Field parameters on ring current and auroral electrojets development during the main phases o f magnetic storms is investigated. According to the preliminary linear correlation analysis for pairs N-AU, N-AL, V-AU, V-AL, By-AU, By-AL, Bz- AU, Bz-AL, N-SYM, N-ASY, V-SYM, V-ASY, By-SYM, By-ASY, Bz-SYM, Bz-ASY it has been established that on ring current intensification significant influence have Solar wind velocity and density. Auroral electrojets development in the greater degree determined by IMF By and Bz components. Typically advancing times for PSW and IMF relatively magnetospheric and ionospheric current systems are about 80 minutes. The results received on the basis of nonlinear connection research for each pair o f indices show that on auroral electrojets development during geomagnetic storm main phase the greatest influence have Solar wind velocity, IMF component Bz and to a lesser degree Solar wind density. Influence of By component expressed poorly. It is established that on the geomagnetic storm main phase westward electrojet developed more strongly than eastward electrojet. For a ring current the strongest agent determining intensity of its symmetric and asymmetric parts is IMF component Bz. Dynamics of Bz component directly drive a ring current behaviour. Solar wind density and velocity have no clear influence on a ring current. Perhaps it’s due to ring current contents up to 80 % ionospheric ions during magnetic storm main phase. A cknow ledgm en ts. Work is executed at partial support under grant of the RFBR 09-05-00495, and also program Ministry o f Education and Science «Development o f higher school scientific potential (2009-2010, project N 1623)». References Gonzalez W. D., J.A. Joselyn, Y. Kamide, H.W. Kroehl, G. Rostoker, В. T. Tsurutani, and V. M. Vasyliunas, What is a geomagnetic storm? // J. Geophys. Res., 99, 5771, 1994. Kokubun S., McPherron R., Russel C. Triggering of substorms by solar wind discontinuities // J. Geophys. Res. V. 82. P. 74-86. 1977. Lyatsky W. and Tan A. Solar wind disturbances responsible for geomagnetic storms // Journal of Geophysical Research, V. 108, N. A3, 1134, doi: 10.1029/2001JA005057, 2003. Sergeev V.A., Pellinen R.J., Pulkkinen T.I. Steady magnetospheric convection: A review o f recent results // Space Sci. Rev. V. 75. P. 551-604. 1996. Solovyev S.I., A.V. Moiseev, E.S. Barkova, K. Yumoto, and M. Engebretson Influence of the Solar Wind Plasma Density on the Auroral Precipitation Characteristics // Geom. and Aeronomy V. 46. N1. P. 44-54. 2006. Tsurutani B.T., W.D. Gonzalez, F. Tang, and Y.T. Lee, Great magnetic storms. // Geophys. Res. Lett., 19, 73, 1992. Zhou X., Tsurutani B.T. Interplanetary shock triggering of nightside geomagnetic activity: Substorms, pseudo­ breakups, and quiescent events // J. Geophys. Res. V. 106. P. 18.957-18.967. 2001. 24