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Solar Physics

, 293:153 | Cite as

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

  • V. M. S. Carrasco
  • J. M. Vaquero
  • M. C. Gallego
  • A. Lourenço
  • T. Barata
  • J. M. Fernandes
Article

Abstract

A sunspot catalogue was published by the Coimbra Astronomical Observatory (Portugal), which is now called the Geophysical and Astronomical Observatory of the University of Coimbra, for the period 1929 – 1941. We digitalised 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 and compare it with the sunspot number index (version 2) and the Balmaceda sunspot area series (Balmaceda et al. in 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 contains reliable sunspot data and can therefore be considered for studies about solar activity.

Keywords

Solar cycle, observations Sunspots, statistics 

Notes

Acknowledgements

This work was partly funded by FEDER-Junta de Extremadura (Research Group Grant GR15137 and project IB16127) and from the Ministerio de Economía y Competitividad of the Spanish Government (AYA2014-57556-P and CGL2017-87917-P). JF, TB, and AL acknowledge support from the Fundação para a Ciência e a Tecnologia and Centro de investigação da Terra e do Espaço da Universidade de Coimbra Funds (UID/Multi/00611/2013) and ReNATURE (CENTRO-01-0145-FEDER-000007). Authors have benefited from the participation in workshops at the International Space Science Institute.

Disclosure of Potential Conflicts of Interest

The authors declare that they have no conflicts of interest.

Supplementary material

11207_2018_1373_MOESM1_ESM.txt (457 kb)
(TXT 457 kB)

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Copyright information

© Springer Nature B.V. 2018

Authors and Affiliations

  1. 1.Departamento de FísicaUniversidad de ExtremaduraBadajozSpain
  2. 2.Instituto Universitario de Investigación del Agua, Cambio Climático y Sostenibilidad (IACYS)Universidad de ExtremaduraBadajozSpain
  3. 3.Departamento de FísicaUniversidad de ExtremaduraMéridaSpain
  4. 4.Centro de Investigação da Terra e do Espaço da Universidade de CoimbraCoimbraPortugal
  5. 5.Observatorio Geofísico e Astronómico da Universidade de CoimbraCoimbraPortugal
  6. 6.Departamento de Matematica da Universidade de Coimbra, Largo D. DinisCoimbraPortugal

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