313 citations · 746 across the 13 of their papers we have counts for
11 papers · 1 filter
Reconstruction of the Sunspot Number Source Database and the 1947 Zurich Discontinuity
Frédéric Clette, Laure Lefèvre, Sabrina Bechet +2
The recalibration of the sunspot number series, the primary long-term record of the solar cycle, requires the recovery of the entire collection of raw sunspot counts collected by t…
Re-calibration of the Sunspot Number: Status Report
F. Clette, L. Lefèvre, T. Chatzistergos +18
We report progress on the ongoing recalibration of the Wolf sunspot number (SN) and Group sunspot number (GN) following the release of version 2.0 of SN in 2015. This report consti…
Nonparametric monitoring of sunspot number observations: a case study
Sophie Mathieu, Laure Lefèvre, Rainer von Sachs +3
Solar activity is an important driver of long-term climate trends and must be accounted for in climate models. Unfortunately, direct measurements of this quantity over long periods…
Uncertainty quantification in sunspot counts
Sophie Mathieu, Véronique Delouille, Laure Lefèvre +2
Observing and counting sunspots constitutes one of the longest-running scientific experiment, with first observations dating back to Galileo and the invention of the telescope arou…
Uncertainties in the Sunspot Numbers: Estimation and Implications
Thierry Dudok de Wit, Laure Lefèvre, Frédéric Clette
Sunspot number series are subject to various uncertainties, which are still poorly known. The need for their better understanding was recently highlighted by the major makeover of…
The new Sunspot Number: assembling all corrections
Frédéric, Clette, Laure Lefèvre
The Sunspot Number, created by R.Wolf in 1849, provides a direct long-term record of solar activity from 1700 to the present. In spite of its central role in multiple studies of th…