Hook-shaped arcs in dayside polar cap and their relation of the IMF

Details Hook-shaped arcs in dayside polar cap and their relation of the IMF Hook-shaped arcs in dayside polar cap and their relation of the IMF

Jun 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986p%26ss...34..489g&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 34, June 1986, p. 489-496.

Computer Science

24

Auroral Arcs, Diurnal Variations, Interplanetary Magnetic Fields, Polar Caps, Spatial Distribution, Daytime, Magnetic Effects, Plasma-Electromagnetic Interaction, Solar Terrestrial Interactions

Scientific paper

A special type of auroral forms has been revealed in the southern polar cap on the basis of Vostok station data. There are hook-shaped arcs consisting of sun-aligned polar cap arcs which convert into latitude-oriented oval arcs. These hook-shaped arcs are seen in the southern polar cap only when B(z) component of the IMF is northward and B(x) is greater than 0. The sun-aligned arcs are grouped in the prenoon sector when B(y) is positive, and they are displaced in the afternoon sector when B(y) is negative. When B(y) is near zero, the sun-aligned arcs are set almost symmetrically relative to the noon meridian. If the hook-shaped arcs display a convection pattern, the occurrence of twin hooks would seem to be in favor of a throat form of the sunward plasma flows exiting the polar cap.

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