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Fig. 6.


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Geomagnetic disturbances of the C05 event (21 January 2005). 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. In every upper-right corner, the subtracted magnetic field value and the difference between the maximum and the minimum value in the last 24 h preceding the disturbance (ΔHmax 24 h) have been indicated. Vertical solid lines, S1 and S2, mark shock discontinuities and vertical dashed lines T1 and T2 mark southward turnings of Bz. These marks are also shown in Figure 8 to facilitate further analysis.

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