The magnetosphere response to solar wind pressure jump depending on direction of the interplanetary magnetic field rotation across the shock front

A usual magnetosphere response to jump of the solar wind dynamic pressure in the low latitudes on the Earth's surface is an abrupt increase of the geomagnetic field at all longitudes at a time. However, this response depends on conditions in the interplanetary magnetic field (IMF). This study shows that a usual magnetosphere response takes place when the IMF Bz turns from zero to the south. When this component turns from zero to the north, the low-latitude geomagnetic field directed to the north may intensify at night and decay (or even turn to the south) by day.