New reconstruction of the sunspot group numbers since 1739 using direct calibration and “backbone” methods

Dependence of the Sunspot-Group Size on the Level of Solar Activity and its Influence on the Calibration of Solar Observers

(2016) I. G. Usoskin et al.   SOLAR PHYSICS

Tests of Sunspot Number Sequences: 3. Effects of Regression Procedures on the Calibration of Historic Sunspot Data

(2016) M. Lockwood et al.   SOLAR PHYSICS

Uncertainties in the Sunspot Numbers: Estimation and Implications

(2016) Thierry Dudok de Wit et al.   SOLAR PHYSICS

The Discontinuity Circa 1885 in the Group Sunspot Number

(2016) E. W. Cliver et al.   SOLAR PHYSICS

Tests of Sunspot Number Sequences: 1. Using Ionosonde Data

(2016) M. Lockwood et al.   SOLAR PHYSICS

The Revised Brussels–Locarno Sunspot Number (1981 – 2015)

(2016) Frédéric Clette et al.   SOLAR PHYSICS

Tests of Sunspot Number Sequences: 4. Discontinuities Around 1946 in Various Sunspot Number and Sunspot-Group-Number Reconstructions

(2016) M. Lockwood et al.   SOLAR PHYSICS

A New Calibrated Sunspot Group Series Since 1749: Statistics of Active Day Fractions

(2016) I. G. Usoskin et al.   SOLAR PHYSICS

Re-examination of the Daily Number of Sunspot Groups for the Royal Observatory, Greenwich (1874 – 1885)

(2016) D. M. Willis et al.   SOLAR PHYSICS

The Impact of the Revised Sunspot Record on Solar Irradiance Reconstructions

(2016) G. Kopp et al.   SOLAR PHYSICS

Reconstruction of the Sunspot Group Number: The Backbone Method

(2016) Leif Svalgaard et al.   SOLAR PHYSICS

A Revised Collection of Sunspot Group Numbers

(2016) J. M. Vaquero et al.   SOLAR PHYSICS

Sunspot Numbers and Areas from the Madrid Astronomical Observatory (1876 – 1986)

(2014) A. J. P. Aparicio et al.   SOLAR PHYSICS

Revisiting the Sunspot Number

(2014) Frédéric Clette et al.   SPACE SCIENCE REVIEWS

Centennial variations in sunspot number, open solar flux, and streamer belt width: 1. Correction of the sunspot number record since 1874

(2014) M. Lockwood et al.   JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS

Forty two years counting spots: Solar observations by D.E. Hadden during 1890–1931 revisited

(2013) V.M.S. Carrasco et al.   NEW ASTRONOMY

Comparison of three solar activity indices based on sunspot observations

(2009) A. P. Sarychev et al.   SOLAR SYSTEM RESEARCH