Terrestrial‐magnetic activity in the year 1933 and at Huancayo

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Abstract
The measures u and u1 of magnetic activity in the year 1933 were computed from the daily means of horizontal intensity at six stations, with the following conversion‐factors k: Watheroo, 1.30, Honolulu, 1.14, San Juan, 1.24, Tucson, 1.44, Cheltenham, 1.55, and De Bilt, 1.75. To insure statistical conformity with the former series, in which always only one station with values of k over 1.50 was included, half weight was given to the results of Cheltenham and De Bilt. For Cheltenham, which appears for the first time in this series, k = 1.55 was obtained by direct comparison of the interdiurnal variability of H at Cheltenham and Seddin for the eight years 1919 to 1926. The data for the four American stations were kindly supplied, in advance of publication, by the Director of the United States Coast and Geodetic Survey.

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