6014 20230106125537.0 10.26093/cds/vizier.36520056 DOI DATASET-2023-0001 Veronig, A. M. Hemispheric Sunspot Numbers 1874-2020 (VizieR Online Data Catalog) 2021 Reconstructed hemispheric sunspot numbers, back to 1874, based on the SILSO international sunspot number and the Greenwich Royal Observatory photographic catalogue. STCE Jain, S. Podladchikova, T. Poetzi, W. Clette, F. frederic.clette@observatoire.be https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/652/A56 DATASET