Possible role of auroral oval-related currents in two intense magnetic storms recorded by old mid-latitude observatories Clementinum and Greenwich | Journal of Space Weather and Space Climate

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Fig. 3

The horizontal intensity and magnetic declination observed at Greenwich during the magnetic storm on 4 February 1872. The baseline value for the horizontal intensity is 18 000 nT. The additional time axis at the top of the figure shows the magnetic local time (MLT).

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