Figure 8
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EISCAT observations at Tromsø: (a) Two-dimensional image of electron density distribution vs. UT and height on 15 May 1997, (b) an average of electron density distributions on some quiet days in April and June of 1997 as a reference, (c) deviation of electron density during the magnetic storm of 15 May 1997 with respect to the quiet reference (Figure from Ma et al., 2002).
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