MHD simulation of the shock wave event on October 24, 2003

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MHD simulation of the shock wave event on October 24, 2003

Ogino, T. / Kajiwara, Y. / Nakao, M. / Park, K.S. / Fukazawa, K. / Yi, Y.

AbstractA three-dimensional global MHD simulation of the interaction between the solar wind and the Earth's magnetosphere has been executed to study the shock wave event on space weather problem on October 24, 2003, when an abnormal operation happened in a satellite for Environment Observation Technology, ADEOS-II (Midori-II). Characteristic features of the event are the long duration of southward IMF, arrival of a strong shock wave, then large variation of IMF $B_{y}$ from negative to positive for about 15min duration. In the simulation, the shock wave compresses the magnetosphere for southward IMF and a hot plasma was injected around the geosynchronous orbit from plasma sheet. During the interval when IMF $B_{y}$ changes from negative to positive, the magnitude of IMF extremely decreases to bring attenuation of magnetic reconnection. The open–closed boundary shrinks in the polar cap and the transient expansion of the magnetic field lines occurs to imply enhancement of particle precipitation. The reconnection site moves from dawn to dusk in the dayside magnetopause and a narrow cockscomb closed field region is formed in the high latitude tail.