On mapping flux transfer events to the ionosphere

Details On mapping flux transfer events to the ionosphere On mapping flux transfer events to the ionosphere

Apr 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....95.3795c&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 95, April 1, 1990, p. 3795-3799.

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22

Earth Ionosphere, Flux Transfer Events, Polar Cusps, Earth Magnetosphere, Interplanetary Magnetic Fields, Magnetic Field Configurations, Magnetopause

Scientific paper

If a flux transfer event is modeled as a round patch of open field lines on an otherwise closed magnetopause, it maps to the ionosphere as an elongated shape pointing radially away from the cusp. This distortion is demonstrated by superposing a cylindrical flux rope field with the shielded Chapman-Ferraro magnetospheric field. The axial component of the flux rope is normal to the planar magnetopause and decreases to zero at the edge of the rope. A series of patches mapped from distances successively further from the subsolar point forms a pattern of striations radiating from the cusp that resembles an observed pattern of auroral arcs in the midday oval, previously interpreted as signatures of magnetosheath plasma injection at the cusp by an unspecified mechanism. The mapping suggests that the mechanism could be patchy reconnection at distances which can be considerably removed from the cusp.

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