Contribution of magnetospheric field-aligned current to geomagnetic bays and Sq fields: A comment on partial ring-current models

摘要

Curved field-aligned currents in the magnetosphere produce a noticeable geomagnetic effect on the earth's surface not only in the D component but also in the H component. For geomagnetic bays or longitudinal asymmetry of ΔH (deviation in H from its quiet level) during magnetic storms, the contribution from the field-aligned currents is greater than that of a partial ring current. The Sq field also may be appreciably influenced by the field-aligned currents associated with the magnetospheric plasma convection.