Magnetospheric convection and current system in the dayside polar CAP

Details Magnetospheric convection and current system in the dayside polar CAP Magnetospheric convection and current system in the dayside polar CAP

Sep 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992esasp.346..183n&link_type=abstract

In ESA, Study of the Solar-Terrestrial System p 183-192 (SEE N93-31674 12-90)

Mathematics

Logic

Convection, Electric Current, Interplanetary Magnetic Fields, Magnetohydrodynamic Flow, Planetary Magnetospheres, Polar Caps, Astronomical Models, Electric Fields, Exos-D Satellite, Magnetic Field Reconnection, Magnetospheric Instability, Satellite Observation

Scientific paper

New information on convection and current systems in the dayside polar cap, obtained through field and particle observations on EXOS-D (Akebono), is summarized and discussed in the context of previously published phenomenological models and interpretations. It was found that convection patterns are distinctly different depending upon whether the Interplanetary Magnetic Field (IMF) Bz is northward or southward. The number of convection cells is two when Bz is southward, but four when Bz is northward. Lobe cells in which plasma flows sunward in the region of open field lines are observed as a pair (of which one is in the dawn and the other in the disk sector) for any polarity of IMF By and Bz. Ions in the keV range precipitate not only in the dayside cusp region, but also along the sunward directed streamlines of the dawn and dusk lobe cells. These observations require reconsideration on the position and the extent of the reconnection region in the magnetopause. They also suggest that the magnetotail plays a vital role in some phenomena which have been ascribed to dayside magnetopause processes. No evidence was found to prove the presence of the viscous cell under southward IMF.

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