Physics
Scientific paper
Jun 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983georl..10..463c&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 10, June 1983, p. 463-466.
Physics
19
Auroral Arcs, Polar Caps, Space Plasmas, Flux (Rate), Magnetohydrodynamic Flow, Spectrograms, Vortices
Scientific paper
Plasma and electric field signatures of polar cap arcs in their formation region above 5000 km are examined. Signatures for active and for quiet magnetic conditions are presented, both indicating a virtual equivalence of plasma and electric field signatures between the polar and evening discrete arcs, although their optical configurations can be very different. It is proposed that the two types of arcs are indeed the same at active times except that the polar cap arcs occur at multiple convection reversal boundaries of plasmasheet plasmas which intrude into the normal polar cap in the form of multiple cellular eddies. A far-reaching consequence of this hypothesis is the unification of arc formation theory clarifying the distinct roles of arc formation parallel electric fields and of arc configuration and location. Optical and particle data which support this hypothesis are discussed.
Chiu Yam T.
Gorney David J.
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