A detailed analysis of electromagnetic fluctuations recorded during several magnetopause and boundary layer crossings by the ESA GEOS‐2 geostationary spacecraft is presented. A high level of electromagnetic (δE/ δB ∼ VA) fluctuations in the ULF (0 ‐ 10 Hz) range is observed for each such crossing. The obtained frequency spectra are shown to fit with a power law B² ∼ f−α. The distribution of these α indexes is found to be narrow (standard deviation ≲ 0.25 for 0.5 ≤ f ≤ 11 Hz), with a peak value α ∼ 2.5 which does not depend on the direction with respect to the magnetic field. Data suggest that the magnetopause boundary layer is the source of these intense fluctuations.
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Rezeau et al. (1986) studied this question.
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