TY - JOUR
T1 - Origin of the interhemispheric potential mismatch of merging cells for interplanetary magnetic field By-dominated periods
AU - Watanabe, Masakazu
AU - Sofko, George J.
AU - Kabin, Konstantin
AU - Rankin, Robert
AU - Ridley, Aaron J.
AU - Clauer, C. Robert
AU - Gombosi, Tamas I.
PY - 2007/10/1
Y1 - 2007/10/1
N2 - When the dawn-to-dusk component of the 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 the duskside merging cell potential in the Northern Hemisphere is much higher than that in the Southern Hemisphere, and the dawnside merging cell potential in the Southern Hemisphere is much higher than that in the Northern Hemisphere. The situation is reversed for IMF BY < 0. This interhemispheric potential mismatch originates from reconnection of overdraped lobe field lines and closed flankside field lines. This type of north-south asymmetric reconnection does not affect the merging cell potentials in the same hemisphere as the reconnection point, whereas in the opposite hemisphere, it diminishes the potential of the dawnside (or duskside) Dungey-type merging cell. Thus the total dawnside (or duskside) merging cell potential in one hemisphere is smaller than that in the other hemisphere by the reconnection voltage associated with the asymmetric reconnection.
AB - When the dawn-to-dusk component of the 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 the duskside merging cell potential in the Northern Hemisphere is much higher than that in the Southern Hemisphere, and the dawnside merging cell potential in the Southern Hemisphere is much higher than that in the Northern Hemisphere. The situation is reversed for IMF BY < 0. This interhemispheric potential mismatch originates from reconnection of overdraped lobe field lines and closed flankside field lines. This type of north-south asymmetric reconnection does not affect the merging cell potentials in the same hemisphere as the reconnection point, whereas in the opposite hemisphere, it diminishes the potential of the dawnside (or duskside) Dungey-type merging cell. Thus the total dawnside (or duskside) merging cell potential in one hemisphere is smaller than that in the other hemisphere by the reconnection voltage associated with the asymmetric reconnection.
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U2 - 10.1029/2006JA012179
DO - 10.1029/2006JA012179
M3 - Article
AN - SCOPUS:37249066221
SN - 2169-9380
VL - 112
JO - Journal of Geophysical Research: Space Physics
JF - Journal of Geophysical Research: Space Physics
IS - 10
M1 - A10205
ER -