This report presents College N-S earth current records
for the month of July 1959. The scale of 1 inch per hour
permits detailed scaling directly from the reproductions
in the report. Scalings of hourly range in amplitude and
rapid fluctuation activity are given. The amplitude scalings
are also presented as curves together with average curves for
a period of several years to show the relative magnitudes of
the July 1959 activity. The earth current always displays
much more pronounced fine structure than the corresponding
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