Features of the polar cap aurorae in the Southern Polar Region

Details Features of the polar cap aurorae in the Southern Polar Region Features of the polar cap aurorae in the Southern Polar Region

May 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988p%26ss...36..429t&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 36, May 1988, p. 429-439.

Physics

31

Antarctic Regions, Auroras, Earth Magnetosphere, Polar Caps, Solar Terrestrial Interactions, Auroral Arcs, Electron Energy, Geomagnetic Tail, Interplanetary Magnetic Fields, Polar Regions, Vostok Spacecraft

Scientific paper

The data of the all-sky camera and photometer at Vostok station in the Antarctic nearpole region have been used for analysis of the auroral features in the Southern Polar Cap. It is shown that the sun-aligned arcs appear in the polar cap with a delay-time of about an hour relative to the northward turning of the IMF and that they can remain for many hours provided that the IMF is invariable. The distribution of these aurorae in the dayside polar cap displays a theta-shaped pattern which is clearly separated from the latitude-oriented arcs in the auroral oval. Disappearance of the sun-aligned arcs after the southward turning of the IMF occurs much faster: in 10-15 min. The observation of the polar cap arcs immersed in a wide band of diffuse luminescence implies that the sun-aligned arcs should be located within the theta-aurora transpolar band. It is concluded that the distribution of the aurorae in the polar cap, auroral oval, and in the day-side cusp requires a closed structure for the magnetosphere. The convection pattern corresponding to a closed magnetosphere suggests the formation of closed cavities with a stagnation plasma regime in the distant tail of the magnetosphere.

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