Reverse convection

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Earth Magnetosphere, Interplanetary Magnetic Fields, Magnetic Dipoles, Polar Caps, Solar Terrestrial Interactions, Topology, Attitude (Inclination), Convection, Flux Transfer Events, Geomagnetic Tail, Magnetic Field Configurations, Magnetopause

Scientific paper

In the past, a northward interplanetary magnetic field (IMF) was the only condition recognized as a requirement for reverse-cell connection. This paper presents a model of magnetospheric topology for periods when the IMF points northward, which shows that there is another, equally important condition: the presence of an overdraped tail lobe created by dipole tilt and/or IMF Bx. The model predicts two quasi-steady state patterns of reverse convection: (1) lobe cells in the polar merging cells in both polar caps, generated by open-to-open flux transfer at the magnetopause; and (2) merging cells in both polar caps, generated by closed-to-open flux transfer at the magnetopause and by balanced open-to-closed transfer at an internal reconnection side, comparable to the tail-merging site for southward IMF.

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