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Butcher 1990
Butcher, E.C. (1990). The prediction of the magnitude of sunspot maxima for cycle 22 using abnormal quiet days in Sq(H). Geophysical Research Letters 17: doi: 10.1029/89GL03645. issn: 0094-8276.

Analysis of abnormal quiet days (or AQDs) in Sq(H) near years of sunspot minimum have successfully been used to predict the maximum annual mean sunspot number Ra-max at the following sunspot maximum. In this paper, the method is used for cycle 22 and predicts a value of Ra-max of 187¿36 and a value of the maximum monthly value of R of 254¿49. ¿ American Geophysical Union 1990

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Abstract
Keywords
Solar Physics, Astrophysics, and Astronomy, Flares
Journal
Geophysical Research Letters
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American Geophysical Union
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