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Geomagnetic disturbances of the 29 October 2003 event. Panel (a) shows measurements of the H component recorded at mid-latitude observatories. From top to bottom: SUA, IRT, FRN, BSL and SPT (increasing in MLong). Panel (b), from top to bottom, displays SYM-H and Dst indices (top panel), and the H component recorded at the four low-latitude observatories involved in the computation of the Dst index: HER, KAK, HON and SJG. Vertical solid line S marks shock discontinuity.
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