Abstract
Riometer recordings of cosmic radio noise in polar regions show a variability in sidereal variation during subsequent quiet days. The fitting of a low‐order Fourier series to maximum density points in sidereal time intervals has the advantage that as few as 7 days may be used to determine a quiet day curve. Quiet day curves determined for periods of 7 days in a sliding sequence show a short‐term variability of about 0.13 dB in signal strength. For periods of 30 days this variability is 10 times less. Absorption events should be obtained from the quiet day curve appropriate for the period of the event. Absorption obtained from quiet day curves determined for maximum density points will be about 0.05 dB less for 30 MHz than using the inflection point method.
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