Abstract
October 18, 1928—A violent magnetic storm began suddenly on October 18 at 7h 24m with an increase of 71γ in 3 minutes in horizontal intensity, and a marked increase in vertical intensity and decrease in declination. The horizontal intensity reached its maximum at 16h 09m and its minimum at 8h 38mon October 18, and during the whole period from the beginning of the storm to the end of the day showed large and rapid fluctuations with sharp peaks and deep bays. The most rapid change was a decrease of 153γ in four minutes, beginning at 8h 34m. The vertical intensity and declination were also severely disturbed, giving a marked saw‐tooth trace for both. After 23h 12m on October 18 the disturbance moderated greatly and ended at approximately 4h on October 19, although there were several hours of subnormal horizontal intensity.
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