Dynamo-based scheme for forecasting the magnitude of solar activity cycles

Details Dynamo-based scheme for forecasting the magnitude of solar activity cycles Dynamo-based scheme for forecasting the magnitude of solar activity cycles

Mar 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991soph..132....1l&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 132, March 1991, p. 1-40.

Physics

37

Dynamo Theory, Prediction Analysis Techniques, Solar Activity, Solar Magnetic Field, Sunspot Cycle, Magnitude, Solar Cycles, Statistical Analysis

Scientific paper

This paper presents a general framework for forecasting the smoothed maximum level of solar activity in a given cycle, based on a simple understanding of the solar dynamo. This type of forecasting requires knowledge of the sun's polar magnetic field strength at the preceding activity minimum. Because direct measurements of this quantity are difficult to obtain, the quality of a number of proxy indicators already used by other authors is evaluated, which are physically related to the sun's polar field. These indicators are subjected to a rigorous statistical analysis, and the analysis technique for each indicator is specified in detail in order to simplify and systematize reanalysis for future use. It is found that several of these proxies are in fact poorly correlated or uncorrelated with solar activity, and thus are of little value for predicting activity maxima. Also presented is a scheme in which the predictions of the individual proxies are combined via an appropriately weighted mean to produce a compound prediction. The scheme is then applied to the current cycle 22, and a maximum smoothed international sunspot number of 171 + or - 26 is estimated.

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