Solar wind-magnetosphere energy coupling under extreme interplanetary conditions: MHD simulations

Details Solar wind-magnetosphere energy coupling under extreme interplanetary conditions: MHD simulations Solar wind-magnetosphere energy coupling under extreme interplanetary conditions: MHD simulations

Jul 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000jastp..62..865l&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 62, Issue 10, p. 865-874.

Physics

2

Scientific paper

In this paper, we present results derived from global magnetohydrodynamic simulations of the response of the magnetosphere to magnetic clouds. The simulations were driven with solar wind data from 10 January 1997 and 4 May 1998. Both periods were major magnetic storms. We find that during moderate periods of magnetic merging between the interplanetary magnetic field (IMF) and the magnetospheric magnetic field, the simulated magnetosphere responds with a loading-unloading behavior characteristic of substorms. However, during periods of strong, sustained, southward IMF, the simulation evolves to a directly driven state, without the loading-unloading component. This behavior is the same as that of the real magnetosphere (Bargatze, L.F., Baker, D.N., McPherron, R.L., Hones, E.W., Jr., 1985. Magnetospheric response for many levels of geomagnetic activity. J. Geophys. Res., 90, 6387-6394), thus providing compelling evidence that the simulation is accurately representing the fundamental features of solar wind-magnetosphere coupling.

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