An unusual type of earth-current variation is regularly observed in the
College records. The phenomena consist of more or less regular fluctuations
with range from a few mv/km to more than 1000 mv/km, and periods ranging upwards
from 6 seconds. The fluctuations may continue from a few minutes to
several hours. They have a strong diurnal variation at College with a broad
maximum at 0600 local time. The fluctuations also occur at a site about 100 km
southeast of College, but are not observed at Barrow« Thus these rapid fluctuations
display characteristics quite different from the previously classified
magnetic and earth-current continuous pulsations, pc's, and train pulsations,
pt's. Special equipment was devised to count and record the period of the
fluctuations on a continuous basis. Typical rapid, fluctuation, traces.and charts
showing their activity patterns are presented.
Table of Contents
Abstract -- Introduction -- Equipment : Geographic location of electrode field ; Stray electric fields ; Electrodes ; Lines ; Recorders ; Cycle counting equipment -- Records and Scaling : Rapid fluctuation records ; Rapid fluctuation at College - selected days ; Rapid fluctuation activity - February 1958 -- Diurnal variation in rapid fluctuation -- Diurnal variation in amplitude and frequency activity ; Rapid fluctuation frequency and period ; Rapid fluctuations at College and at Barrow -- Discussion : Comparison of earth-current rapid fluctuations with geomagnetic pulsations ; Comparison with other earth-current pulsation studies ; Diurnal Variation in amplitude and fluctuation
frequency activity at College ; Generation of earth-current rapid fluctuation -- Summary -- Bibliography -- Figures
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