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Upper panel: SYM-H, Dst, Ap, and AE indices during the 13–15 February 2011 geomagnetic event. Bottom panel: corresponding Int(d(SYM-H)/dt) (in nT), and IntDst, IntAp, and IntAE (in nT·hr) cumulative parameters, calculated using thresholds SYM-H ≤ −30 nT, Dst ≤ −30 nT, or ap ≥ 15 nT.
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