Abstract
The relationships between geomagnetic micropulsations and pulsations in auroral luminosity are considered. Several features are found to be compatible with the concept of drainage of trapped radiation in the region of the outer Van Allen radiation belt in the western hemisphere. Certain homogeneous auroral arcs noted by Stormer at a height of 200 km in central Norway have a mirror point for trapped particles computed to be below ground level in the south Indian Ocean, a region likely to need surveys of the earth's main field. The magnetic-field gradients near the night-time electro jets near the northern and southern auroral zones will change the sign of drift of auroral particles, so that electrons spiraling up or down the geomagnetic-field lines may drift westward in some regions and eastward in others. The gradients of the transient electrojet fields may help to explain many of the complex features of auroral forms, when aurora are formed by incoming charged particles.
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