Computer Science
Scientific paper
Oct 1974
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974natur.251..592b&link_type=abstract
Nature, vol. 251, Oct. 18, 1974, p. 592-594.
Computer Science
15
Geomagnetism, Magnetic Effects, Magnetic Variations, Solar Activity Effects, Sunspot Cycle, Diurnal Variations, Meteorology, Periodic Variations, Secular Variations, Solar Wind, Winter
Scientific paper
Methods for predicting sunspot activity are discussed, giving attention to the possibility that solar activity may be controlled by the tidal influence of the planets. A graph showing the diurnal variation of the occurrence of the time of the daily minimum horizontal field for all the international quiet days in the period from 1884 to 1972 is presented. Relations regarding 'abnormal quiet days' (AQD) are investigated. It is pointed out that the solar cycle is a much more complicated periodicity than indicated by the variation of any one index of activity. There appears to be a long term secular trend in AQD occurrence, evidenced by the almost continual increase in the size of the minimum count of each cycle.
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