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(a) Annual means of the corrected aa index, aa H. (b) The coefficients of determination (r 2, where r is the correlation coefficient) for 1-year sequences of northern and southern hemisphere indices: (green) the classic aa indices aa S and aa N; (black) the corrected aa indices aa HN and aa HS; (red) daily means of the classic aa indices, Aa S and Aa N; and (blue) daily means of the corrected aa indices Aa HN and Aa HS.
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