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Universal Time variations sorted by the prevailing polarity of the IMF in the GSEQ frame ([BY]GSEQ, averaged over the prior hour). (a) The normalised estimated power input into the magnetosphere, Pα/Po, for (green line) [BY]GSEQ > 0, and (mauve line) [BY]GSEQ < 0. (b) The fractional variation of the geomagnetic indices for [BY]GSEQ > 0. (c) The fractional variation of the geomagnetic indices for [BY]GSEQ < 0. Black lines are for the am index, the red lines for the an index and the blue lines are for as.
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