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Fig. 7


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Bicubic-spline interpolated (Smith & Wessel, 1990), maximum peak-to-peak, Halloween storm-time, electric field magnitudes at 21:20 UT on 30th October 2003 for (a) E x and (b) E y polarisation using measured impedances ( Z ij ); c) E x and d) E y polarisation using modified impedances (). Stars indicate impedance-tensor site locations.

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