44 citations · 66 across the 2 of their papers we have counts for
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astro-ph.SR2016★ 22 cited
Tests of Sunspot Number Sequences: 1. Using Ionosonde Data
M. Lockwood, C. J. Scott, M. J. Owens +2
More than 70 years ago it was recognised that ionospheric F2-layer critical frequencies had a strong relationship to sunspot number. Using historic datasets from the Slough…
astro-ph.SR2015★ 44 cited
Tests of sunspot number sequences: 3. Effects of regression procedures on the calibration of historic sunspot data
M. Lockwood, M. J Owens, L. Barnard +1
We use sunspot group observations from the Royal Greenwich Observatory (RGO) to investigate the effects of intercalibrating data from observers with different visual acuities. The…