Influences of the interplanetary magnetic field clock angle and cone angle on the field-aligned currents in the magnetotail

The influences of the interplanetary magnetic field (IMF) cone angle theta and clock angle phi on the field-aligned currents (FACs) at the plasma sheet boundary layers (PSBLs) have been investigated using Cluster Data. The FAC occurrence increases monotonically with IMF cone angle and has two peaks at -90 degrees and +110 degrees clock angle, respectively. The peak at +110 degrees is distinctly larger than that at 90 degrees. Overall, there are more FACs between 0 degrees 更多