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The H-component of the magnetic storm of 14–15 May 1921 as recorded by Angenheister & Westland (1921) at Apia, Samoa. The red oval encompasses a positive bay in the H-component magnetogram that was coincident with the observation of a rare low-latitude aurora. The chart is marked in Universal Time. [Adapted from Silverman & Cliver 2001, with permission from Elsevier.]
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