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Tests of sunspot number sequences: 4. Discontinuities around 1946 in various sunspot number and sunspot group number reconstructions
Mike Lockwood, Mathew J. Owens, Luke A. Barnard
We use 5 test data series to quantify putative discontinuities around 1946 in 5 annual-mean sunspot number or group number sequences. The series tested are: the original and new ve…
Tests of Sunspot Number Sequences: 2. Using Geomagnetic and Auroral Data
Mike Lockwood, Mathew J. Owens, Luke A Barnard +3
We compare four sunspot-number data sequences against geomagnetic and terrestrial auroral observations. The comparisons are made for the original SIDC composite of Wolf-Zurich-Inte…
An Assessment of Sunspot Number Data Composites over 1845-2014
Mike Lockwood, Mathew J. Owens, Luke A. Barnard +1
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 use…