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

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

(2016) M. Lockwood et al.   SOLAR PHYSICS

Sunspot Observations of Rudolf Wolf from 1849 – 1893

(2016) Thomas K. Friedli   SOLAR PHYSICS

The Discontinuity Circa 1885 in the Group Sunspot Number

(2016) E. W. Cliver 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

Newly found sunspot observations by Peter Becker from Rostock for 1708, 1709, and 1710

(2015) R. Neuhäuser et al.   ASTRONOMISCHE NACHRICHTEN

The Maunder minimum (1645–1715) was indeed a grand minimum: A reassessment of multiple datasets

(2015) Ilya G. Usoskin et al.   ASTRONOMY & ASTROPHYSICS

The Solar Cycle

(2015) David H. Hathaway   Living Reviews in Solar Physics

The Maunder minimum (1645–1715) was indeed a grand minimum: A reassessment of multiple datasets

(2015) Ilya G. Usoskin et al.   ASTRONOMY & ASTROPHYSICS

Cyclic and secular variations sunspot groups with various scales

(2014) V. N. Obridko et al.   ASTRONOMY REPORTS

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

Sunspot positions and sizes for 1825–1867 from the observations by Samuel Heinrich Schwabe

(2013) R. Arlt et al.   MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY

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

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

ON A POSSIBLE EXPLANATION OF THE LONG-TERM DECREASE IN SUNSPOT FIELD STRENGTH

(2012) Yury A. Nagovitsyn et al.   Astrophysical Journal Letters

The solar magnetic field since 1700

(2011) J. Jiang et al.   ASTRONOMY & ASTROPHYSICS

TIME DISTRIBUTIONS OF LARGE AND SMALL SUNSPOT GROUPS OVER FOUR SOLAR CYCLES

(2011) A. Kilcik et al.   ASTROPHYSICAL JOURNAL

Comparison of three solar activity indices based on sunspot observations

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