Correlation Between the Solar Activity Indices and the Use of these Indices in the Study of Motion of the Earth Satellites
Correlation between the 10.7-cm solar flux (F 10.7), the visible solar spot area (S d) and the geomagnetic planetary index (A p) have been investigated for the 27-day intervals over the period 1957-1966. F 10.7 and S d are the indices connected with the solar UV-radiation. A p is the index connected with the corpuscular radiation. S d does not correlate usually with A p . S d correlate strongly with F 10.7 in the course of the 11-year solar cycle. The correlation is intense for the 27-day intervals also and the variations of the regression are especially great during the minimum of solar activity. This fact implies that S d and F 10.7 represent the effects of the solar UV-radiation not quite sufficiently. This fact is possible to account for the difficulties occurred when taking into consideration the air drag perturbations from the solar activity by means of the indices mentioned.
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