Abstract
(Latitude 38° 44′.0 N., longitude 76° 50′.5 or 5h 07m3 W. of Gr.)July 18–19—Following a very slight disturbance in D and H, a mild magnetic storm began with a sudden commencement in all three elements at 09h 04m GMT, July 18, and persisted until about 15h, July 19. The first half of the storm consisted of rapid pulsations of small amplitude in both H and D. The character of the disturbance gradually changed to irregular oscillations of moderate amplitude, the change occurring in D at about 22h, July 18, and in H at about 02h, July 19. The Z‐trace did not exhibit serious disturbance at any time. Two K‐indices of 5 and six of 4 were recorded.
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