AURORAL OBSERVATIONS USING AUTOMATIC OPTICAL-INSTRUMENTS - RELATIONS WITH MULTIPLE PI-2 MAGNETIC PULSATIONS

Auroral observations using automatic optical instruments have been con ducted during the Solar Terrestrial Energy Program (STEP) period, at s everal latitudes along, lower, and higher than the auroral zone, toget her with the chain stations along 210 degrees magnetic meridian. This paper gives details of the instrumentation and the locations of statio ns. In an initial analysis, auroral data from an auroral zone station at Kotzebue, Alaska, and magnetic field data from both high- and low-l atitude stations along the 210 degrees and 250 degrees magnetic meridi ans were used to demonstrate the relations between auroral substorm on sets and multiple Pi 2 magnetic pulsations. The correspondence between each Pi 2 onset and each small- or large-scale brightening and polewa rd expansion of auroras during an auroral substorm with multiple onset s was good.