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A sunspot catalogue was published by the Coimbra Astronomical Observatory(Portugal), now named Geophysical and Astronomical Observatory of theUniversity of Coimbra, for the period 1929-1941. We digitalized data includedin that catalogue and provide a machine-readable version. We show thereconstructions for the (total and hemispheric) sunspot number index andsunspot area according to this catalogue, comparing it with the sunspot numberindex (version 2) and Balmaceda sunspot area series (Balmaceda et al., J.Geophys. Res. 114, A07104, 2009). Moreover, we also compared the Coimbracatalogue with records made at the Royal Greenwich Observatory. The resultsdemonstrate that the historical catalogue compiled by the Coimbra AstronomicalObservatory contain reliable sunspot data and therefore can be considered forstudies about solar activity.

Sunspot Catalogue of the Observatory of the University of Coimbra (1929-1941)