Meridional characteristics of a Pc 4 micropulsation event in the plasmasphere |
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| Authors: | CA Green |
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| Institution: | Geomagnetism Unit, Institute of Geological Sciences, Murchison House, West Mains Road, Edinburgh EH93LA, Scotland, UK |
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| Abstract: | An analysis was made of a complex large amplitude Pc 4 micropulsation, of four hours duration around local noon, observed at five ground stations in the United Kingdom (2.4? L ?3.8). The final pulsation waveform was shown to be the results of the superposition of wave packets of different periods. The meridional variation of the amplitude of the different period wavepackets was consistent with their being fundamental “toroidal” field line resonances within the plasmasphere, rotated through 90° in their transmission through the ionosphere in accordance with recent theoretical predictions. Other predicted ionospheric effects, such as the loss of the sense-of-polarization reversal across the amplitude maximum, were apparent in the meridional variation of the polarization characteristics. |
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