Hemispheric Sunspot Numbers R n and R s from 1945 – 2004 : Catalogue ⋆ and N-S asymmetry analysis for solar cycles 18 – 23

From sunspot drawings provided by the Kanzelhöhe Solar Observatory, Austria, and the Skalnaté Pleso Observatory, Slovak Republic, we extracted a data catalogue of hemispheric Sunspot Numbers covering the time span 1945–2004. The validated catalogue includes daily, monthly-mean, and smoothed-monthly relative sunspot numbers for the northern and southern… CONTINUE READING