We have been looking at the properties of the solar wind at 1 AU and the physics of solar-wind/magnetosphere coupling. The solar-wind plasma is filled with wind shears. The velocity jumps across the shear layers can be Mach 1 or greater. Several times per day an abrupt wind shear passes the Earth. Global MHD simulations indicate that these wind shears can produce comet-like disconnections of the Earth’s magnetotail, and in fact produce disconnections of the bow shock and magnetosheath along the flanks of the tail. In the talk we will overview the solar wind and solar-wind/magnetosphere coupling, and look at the sudden wind shears and their effects on the magnetosphere.