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The horizontal trace of the Kew magnetogram from 10:12 UT on 1 September 1859 to 10:10 UT on 2 September 1859 (after Stewart 1861 and Bartels 1937). The times of the prompt (magnetic crochet or solar flare effect) and delayed (geomagnetic storm onset) responses to the Carrington flare are indicated by arrows.
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