The article is devoted to the experimental study of the possibility of long-term forecasting of a random component of geomagnetic and solar activity on the base of macroscopic nonlocality effect. The forecasting algorithm, employing the nonlocal correlation detector measurements, is suggested. Its efficiency is proved on data of the long-term experiments in the regime of real forecast simulation with advancement up to four months. All methods employed at present of the forecast of geomagnetic activity operate with its components determined by external factors and its own evolution (even if statistical approaches are used).
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