Abstract
On May 13, 1921, at 13h 10m, there began the most violent magnetic storm registered at this observatory since 1910. The first movement was a very sudden one: towards east in declination, and a decrease in the horizontal intensity, followed by a rapid change to an increase. The oscillation of the vertical component was so rapid that its initial direction could not be determined.At 19h 18m of May 13 there occurred again sudden jumps in the three elements; there next followed very rapid oscillations, generally of a short amplitude, until the next day, May 14, at 16h 15m, when the general character of the former perturbation was reproduced with a maximum intensity between 22h 15m, May 14, and 8h, May 15, during which time the curves left the photographic sheet several times; the H‐component particularly remained off the sheet from 3h to 11h, May 15, and 8h to 10h, May 16.
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