Abstract
The spatial pattern of auroral electron precipitation during magnetically quiet intervals was studied. The result is compared with the Feldstein auroral oval and other reported configurations of auroral optical emission. The precipitation of auroral electrons takes place in an irregularly shaped annular belt encircling the pole. The belt is composed of two parts: the equatorial part (average energy > 500 eV) coincides with the 3914 Å diffuse auroral emission region and includes the Feldstein oval. It is absent in the afternoon sector. The poleward, low-energy part is a dayside belt, observed from 03 to 21 h magnetic local time. The high-latitude dayside discrete auroras as well as the sun-aligned arcs are embedded in the belt. A graph illustrates present and previous observations from space- and ground-based platforms; various interpretations of the quiet-time distribution of auroral phenomena are compared.
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