Читать книгу Space Physics and Aeronomy, Ionosphere Dynamics and Applications - Группа авторов - Страница 29

We review the excitation of high‐latitude ionospheric convection by the interaction of the solar wind with the magnetosphere and the coupling between the magnetosphere and ionosphere. We discuss the role of magnetic reconnection in driving the Dungey cycle of convection, and the influence of frictional coupling between the ionosphere and atmosphere in modifying this convection. The electric current systems that transport stress and momentum throughout the system are described, as well as the magnetic perturbations that they produce on the ground. The system is first described as a steady‐state approximation, and then the time‐dependent expanding/contracting polar cap model of the Dungey cycle is introduced, together with its relation to the substorm cycle.