W. Pötzi

Space weather: the solar perspective -- an update to Schwenn (2006)

Root mean square error or mean absolute error? Use their ratio as well

A comparison of long-term parallel measurements of sunshine duration obtained with a Campbell-Stokes sunshine recorder and two automated sunshine sensors

Hemispheric sunspot numbers ${R_{n}}$ and ${R_{s}}$ from 1945–2004: catalogue and N-S asymmetryanalysis for solar cycles 18–23