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

Abstract

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

References in corpus (2)

• Sunspot Catalogue of the Valencia Observatory (1920-1928)
• Equivalence relations between the Cortie and Zurich sunspot group morphological classifications

Cited by in corpus (5)

• Re-calibration of the Sunspot Number: Status Report
• Scrutinizing the relationship between plage areas and sunspot areas and numbers
• Eric Strach: four decades of detailed synoptic solar observations (1969-2008)
• Solar observatory Einstein Tower -- Data release of the digitized solar full-disk photographic plate archive
• Testing the accuracy of Coimbra Astronomical Observatory solar filament historical series (1929-1941)