Abstract
(Latitude 38° 44′.0 N., longitude 76° 50′.5 or 5h 07m.4 W. of Gr.)January 3–4—A moderately severe storm seemed to have its real beginning sharply at 08h 10m GMT, January 3, although this was preceded by a much smaller beginning, also sharp, at 07h 0lm. Short‐period activity predominated at first, and later was superimposed on slower changes of relatively large range. K‐indices of 7 were recorded for the fourth and fifth three‐hour periods of January 3. There was no important activity after 10h, January 4.
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