Dayside merging and cusp geometry

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Cusps, Daytime, Geomagnetism, Interplanetary Magnetic Fields, Magnetic Effects, Magnetic Field Configurations, Magnetopause, Convection, Lines Of Force, Magnetohydrodynamic Flow, Magnetosheath, Plasma Layers, Polar Regions

Scientific paper

Geometrical considerations are presented to show that dayside magnetic merging when constrained to act only where the fields are antiparallel results in lines of merging that converge at the polar cusps. An important consequence of this geometry is that no accelerated flows are predicted across the dayside magnetopause. Acceleration owing to merging acts in opposition to the magnetosheath flow at the merging point and produces the variably directed, slower-than-magnetosheath flows observed in the entry layer. Another consequence of the merging geometry is that much of the time closed field lines constitute the subsolar region of the magnetopause. The manner in which the polar cap convection patterns predicted by the proposed geometry change as the interplanetary field is rotated through 360 deg provides a unifying description of how the observed single circular vortex and the crescent-shaped double vortex patterns mutually evolve under the influence of a single operating principle.

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