Abstract
(Latitude 12° 02′.7 S.; longitude, 75° 20′.4 or 5h 01m W. of Gr.)February 13, 1931—There was a short magnetic disturbance on February 13, beginning at 8h 58m (Greenwich mean time), with a rise of 28γ in five minutes in the horizontal‐intensity trace. The disturbance was characterized by several sharp peaks and bays in horizontal intensity and by marked variations in the declination and vertical intensity. There was no sign of the subnormal horizontal‐intensity values that usually mark magnetic storms at this observatory, either during the storm or thereafter. The storm ended February 13 at about 22h. The ranges were 6′.0, 140γ, and 36γ in declination, horizontal intensity and vertical intensity, respectively.
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