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(a) Sfe at KAK produced by a C9.7 flare (July 8, 2013, at 01:21 UT). The variation ΔB was 7 nT but with a duration, Δt, of 10 min. (b) Sfe at KAK produced by a X2.2 flare (May 13, 2013, at 01:57 UT). The variation ΔB was 15 nT but with a duration, Δt, of 35 min.
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