Solar wind penetration into the high-latitude magnetosphere: Cluster observations

In this paper, using Cluster multi-spacecrafts observation data during January to April of each year from 2001 to 2006, we have studied the solar wind penetration events into the Earth's high-latitude magnetosphere. When the IMF is northward, although the formation of the entry layers depends on the direction of IMF, we pointed out that it mainly depends on the IMF Bx component and the influences of IMF By component could be weak.