Abstract

There was a severe magnetic storm recorded at Lukiapang from August 11 to 13, 1919. It seems to have been more violent than the great storm of September 25, 1909, certainly the perturbations were sharper if not of greater magnitude. The storm started quite suddenly at 14h 58m (China Central Time) on August 11 simultaneously for the three elements, west declination decreasing, horizontal intensity increasing, and vertical intensity decreasing. The movements were so rapid that no visible trace was obtained for the horizontal intensity.

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