The Scandinavian Twin Auroral Radar Experiment (STARE) has proved useful in estimating the ionospheric electric fields of several types of ULF pulsation. These usually involve the propagation of hydromagnetic waves along the geomagnetic field lines. Reflection at the auroral ionosphere boundary can then result in standing wave resonances. Because of its good spatial resolution and coverage of this boundary, STARE provides unique data on the spatial variations of the pulsation fields. Background theoretical aspects and STARE observations are presented for three types of pulsation: impulsive or ringing Pc 5, monochromatic resonant Pc 5, and pulsations thought to be generated by instabilities in the ring current particle population. Since the ionosphere is resistive, it acts as an energy sink for the pulsations, and estimates of the ionospheric Joule heating are presented. Finally, some suggestions for future work are given.
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Allan et al. (1984) studied this question.
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