Auroral Observations Using Automatic Optical Instruments: Relations with Multiple Pi 2 Magnetic Pulsations

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Auroral observations using automatic optical instruments have been conducted during the Solar Terrestrial Energy Program (STEP) period, at several latitudes along, lower, and higher than the auroral zone, together with the chain stations along 210° magnetic meridian. This paper gives details of the instrumentation and the locations of stations. In an initial analysis, auroral data from an auroral zone station at Kotzebue, Alaska, and magnetic field data from both high- and low-latitude stations along the 210° and 250° magnetic meridians were used to demonstrate the relations between auroral substorm onsets and multiple Pi 2 magnetic pulsation. The correspondence between each Pi 2 onset and each small- or large-scale brightening and poleward expansion of auroras during an auroral substorm with multiple onsets was good.