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Abstract FormSolar wind control of the substorm westward electrojet I.V. Despirak 1 , A.G. Yahnin 1 , A.A. Lubchich 1 , A.B. Pashin 1 and A.L. Kotikov 2 1. Polar Geophysical Institute, Apatity, Russia 2. Institute of Physics, University of St-Petersburg, St-Petersburg, Russia During the expansion phase of a substorm the westward electrojet expands poleward following the auroral expansion. Sometimes the electrojet propagates from the auroral zone up to very high latitudes (CGLat >75-80). These substorms are called "high-latitudinal" substorms. Sergeev et al (1979) and Dmitrieva and Sergeev (1984) showed that such "high-latitudinal" substorms occur under high-speed solar wind, and the latitude of the electrojet propagation is higher when the solar wind velocity is larger. It was shown that "high-latitudinal" substorms occur more frequently during the solar cycle |
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