Pc 3–4 ULF magnetic variations measured in the ionosphere by Eiscat

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Abstract
ULF pulsations of Pc 3–4 type were recorded in the ionosphere at several longitudes with the European Incoherent Scatter facility. The analysis of these pulsations needs sophisticated signal processing. We found that a detailed description of these pulsations must be made burst by burst. The characteristic parameters are time, frequency, and space extent. Comparison with ground recordings indicates that only the H component is well related to the ionospheric ion velocity. The ionosphere‐ground relation is discussed in terms of variability of the auroral conductivity and spatial extent.