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AN ASSESSMENT OF SUNSPOT NUMBER DATA COMPOSITES OVER 1845–2014
2016
Astrophysical Journal
New sunspot data composites, some of which are radically different in the character of their long-term variation, are evaluated over the interval 1845-2014. The method commonly used to calibrate historic sunspot data, relative to modern-day data, is "daisy-chaining", whereby calibration is passed from one data subset to the neighbouring one, usually using regressions of the data subsets for the intervals of their overlap. Recent studies have illustrated serious pitfalls in these regressions and
doi:10.3847/0004-637x/824/1/54
fatcat:jzzod3cgvzgd3dsmhlo3wzf4lq