Plasma flow reversals at the dayside magnetopause and the origin of asymmetric polar cap convection

Details Plasma flow reversals at the dayside magnetopause and the origin of asymmetric polar cap convection Plasma flow reversals at the dayside magnetopause and the origin of asymmetric polar cap convection

Jun 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....95.8073g&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 95, June 1, 1990, p. 8073-8084. Research sponsored by DOE.

Physics

162

Convection, Magnetic Field Reconnection, Magnetohydrodynamic Flow, Magnetopause, Polar Caps, Reversed Flow, Boundary Layers, Deceleration, International Sun Earth Explorer 2, Tables (Data), Velocity Distribution

Scientific paper

Events observed in a fast plasma experiment, where the y-component of the plasma flow within the low latitude boundary layer and magnetopause current layer was oppositely directed to that in the adjacent magnetosheath, are examined. The observations are shown to be qualitatively and quantitatively consistent with previous observations of accelerated flows at the magnetopause and with models of magnetic reconnection, with reconnection occurring at low latitudes near the GSE XY plane, independently of the magnitude or the sign of the y-component ot the local magnetosheath magnetic field. Local magnetic shears at the magnetopause for these events (in 60-180 deg range) and the fact that these events occur at low latitudes do not support the antiparallel merging hypothesis. The observations of B(y)-dependent flow reversals demonstrate how the asymmetric polar cap convection and related phenomena, such as the Svalgaard-Mansurov effect, originate in magnetic reconnection at the dayside magnetopause.

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