PROBLEMS OF GEOCOSMOS

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Proceedings of the 7th International Conference "Problems of Geocosmos" (St. Petersburg, Russia, 26-30 May 2008) The variations of the H-component of the geomagnetic field at the low-latitude stations quantitatively depend on the variations of the solar wind dynamic pressure. See for example formulae (3) from [Siscoe G.L., 1968]. ∆B = k − SSC ( pS pS 0 It is known that two main factors determine SSC rise time: orientation and velocity of interplanetary shock. When interplanetary shock is highly inclined the SSC rise may be longer than the rise time of the solar wind dynamic pressure [T.Takeuchi et al., 2002]. Velocity of shock is greater in the interplanetary medium than in the magnetosheath. So shock with smaller velocity would produce greater SSC rise time. Besides taking into account these two factors we consider that the rise time observed at the Earth’s surface would be smaller than the observed rise time because orientation of the shock and smaller shock velocity increase the SSC rise time. In all cases we see that rise time of the magnetic field on the ground and at geostationary orbit are proportional to the rise time of solar wind dynamic pressure. At the same time the magnetic field on the ground and in the magnetosphere in all cases less than rise time of the solar wind dynamic pressure. We associate these differences in the rise time with an influence of secondary rarefaction wave on the geomagnetic field. Conclusions. We obtain that the magnitude of the magnetic field decrease during SSC event. We suppose that this decrease is associated with the generation of secondary rarefaction wave appearing in the magnetosheath during the interaction of interplanetary shock wave with the bow shock-magnetopause system. The data from the WIND and GOES satellites ware taken from the site http://cdaweb.gsfc.nasa.gov/. The data from the ground-based stations ware taken from the site http://swdcwww.kugi.kyoto-u.ac.jp/ Acknowledgements. The work of the first author was supported by the Russian Foundation for Basic Research (project no. 08-01-00191) and by Department of the Physics Science (program 16). The work of the second author was supported by the Russian Foundation for Basic Research (project no. 06-05-64374) and by Presidium of the Russian Academy of Science (program 16). References Araki, T. A physical model of the geomagnetic sudden commencement // Solar wind sources of magnetospheric ultra-low-frequency waves. Geophys. Monograph, Ser. AGU. Washington, D.C.81, p.183- 200, 1994. Grib, S.A., B.E. Briunelli, M. Dryer, and W.-W. Shen. Interaction of interplanetary shock waves with the bow shock-magnetopause system, J. Geophys. Res., 84, 5907-5921, 1979. Kokubun, S. Characteristics of storm sudden commencement at geostationary orbit, J. Geophys. Res., 88, p. 10025-10033, 1983. Russell, C. T., Ginskey, M., Petrinec, S., Le, G. The effect of solar wind dynamic pressure changes on low and mid-latitude magnetic records // Geophys. Res. Letters, 19, p.1227-1230, 1992. Samsonov A.A., Sibeck D.G., Imber J. MHD simulation for the interaction of an interplanetary shock with the Earth’s magnetosphere // J. Geophys. Res., vol.112, A12220, 2007. Samsonov A.A., Nemecek Z., Safrankova J.. Numerical MHD modeling of propagation of interplanetary shock through the magnetosheath // J. Geophys. Res., vol.111, A08210, 2006. Safrankova J., Nemecek Z., Prech L., Samsonov A.A., Koval A., Andreeova K.. Modification of interplanetary shocks near the bow shock and through the magnetosheath // J. Geophys. Res., vol.112, A08212, 2007. Siscoe G.L., Formisano V., Lazarus A.J. Relation between geomagnetic, sudden and solar wind pressure changes –an experimental investigation// J.Geophys.Res, 73, №15, р. 4869, 1968. Takeuchi T., Russell C. T., Araki T. Effect of the orientation of interplanetary shock on the geomagnetic sudden commencement // // J.Geophys.Res., 107, A12, 1423, 2002. 83 ) ( 3)
Proceedings of the 7th International Conference "Problems of Geocosmos" (St. Petersburg, Russia, 26-30 May 2008) Zhuang H.C., Russel C.T., Smith E.J., and Gosling J.T. Three-dimensional interaction of interplanetary shock waves with the bow shock and magnetopause: a comparison of theory with ISEE observations // J.Geophys. Res.V.86, A7, p. 5590-5600, 1981. 84
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PROBLEMS OF GEOCOSMOS

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