Origin of the interhemispheric potential mismatch of merging cells for interplanetary magnetic field BY-dominated periods

摘要: [1] When the dawn-to-dusk component of interplanetary magnetic field (IMF BY) is dominant, ionospheric convection exhibits a basic two-cell pattern with significant dawn-dusk and interhemispheric asymmetries. For IMF BY > 0 duskside merging cell potential in Northern Hemisphere much higher than that Southern Hemisphere, dawnside Hemisphere. The situation reversed for < 0. This mismatch originates from reconnection overdraped lobe lines closed flankside lines. type north-south asymmetric does not affect potentials same hemisphere as point, whereas opposite hemisphere, it diminishes (or duskside) Dungey-type cell. Thus total one smaller other by voltage associated reconnection.