On Permanent Periodicity in Sunspots . 0 10 20 30 40 50 Final mean curves: 60 70 80 90 100 120 130 and doubled departure from 30 40 50 60 70 80 90 100 Periodic components, modified data. 120 On Permanent Periodicity in Sunspots. 499 conspicuous cycles shown in fig. 1 between 1776 and 1798. The course verystrongly suggested is to omit them from the data to be analysed, as for somereason wholly foreign to the problem; this will in no way affect the validityof the analyses of the rest of the sunspot graph, but the question willremain over, whether there has been error
On Permanent Periodicity in Sunspots . 0 10 20 30 40 50 Final mean curves: 60 70 80 90 100 120 130 and doubled departure from 30 40 50 60 70 80 90 100 Periodic components, modified data. 120 On Permanent Periodicity in Sunspots. 499 conspicuous cycles shown in fig. 1 between 1776 and 1798. The course verystrongly suggested is to omit them from the data to be analysed, as for somereason wholly foreign to the problem; this will in no way affect the validityof the analyses of the rest of the sunspot graph, but the question willremain over, whether there has been error of record or whether some over-mastering transient cause has completely masked the normal run of thedata. When the magnitude and the time-scale of the solar phenomenathat are involved is borne in mind, the former alternative seems to be thepreferable one; it was the one adopted by Newcomb for reasons quotedsupra* The two sunspot cycles from 1776 to 1798 have been accordingly omittedand the remainder of the data divided into three groups of nearly equal duration: ( ) 1750 to 1822, omitting 1776 to 1798, ( ) 1822 to 1867, (... ) 1867 to 1912.
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