Solar Physics

, 293:153 | Cite as

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

  • V. M. S. CarrascoEmail author
  • J. M. Vaquero
  • M. C. Gallego
  • A. Lourenço
  • T. Barata
  • J. M. Fernandes


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.


Solar cycle, observations Sunspots, statistics 



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)


  1. Balmaceda, L.A., Solanki, S.K., Krivova, N.A., Foster, S.: 2009, A homogeneous database of sunspot areas covering more than 130 years. J. Geophys. Res. 114, A07104. DOI. ADSCrossRefGoogle Scholar
  2. Baranyi, T., Győri, L., Ludmány, A.: 2016, On-line tools for solar data compiled at the Debrecen Observatory and their extensions with the Greenwich sunspot data. Solar Phys. 291, 3081. DOI. ADSCrossRefGoogle Scholar
  3. Bonifácio, V.: 2017, Costa Lobo (1864 – 1945), the Coimbra spectroheliograph and the internationalisation of Portuguese astronomy. In: History of Astronomy in Portugal, Imprimerie Centrale de l’Université de Nantes, Nantes, 113. Google Scholar
  4. Carrasco, V.M.S., Vaquero, J.M., Aparicio, A.J.P., Gallego, M.C.: 2014, Sunspot catalogue of the Valencia Observatory (1920 – 1928). Solar Phys. 289, 4351. DOI. ADSCrossRefGoogle Scholar
  5. Carrasco, V.M.S., Lefèvre, L., Vaquero, J.M., Gallego, M.C.: 2015, Equivalence relations between the Cortie and Zürich sunspot group morphological classifications. Solar Phys. 290, 1445. DOI. ADSCrossRefGoogle Scholar
  6. Clette, F., Svalgaard, L., Vaquero, J.M., Cliver, E.W.: 2014, Revisiting the sunspot number. A 400-year perspective on the solar cycle. Space Sci. Rev. 186, 35. DOI. ADSCrossRefGoogle Scholar
  7. da Costa Lobo, F.M.: 1929, Introdução, Anais do Observatório Astronómico da Universidade de Coimbra, Universidade de Coimbra, Coimbra. Google Scholar
  8. Erwin, E.H., Coffey, H.E., Denig, W.F., Willis, D.M., Henwood, R., Wild, M.N.: 2013, The Greenwich photo-heliographic results (1874 – 1976): Initial corrections to the printed publications. Solar Phys. 288, 157. DOI. ADSCrossRefGoogle Scholar
  9. Hoyt, D.V., Eddy, J.A.: 1982, An atlas of variations in the solar constant caused by sunspot blocking and facular emissions from 1874 to 1981, National Center for Atmospheric Research, NCAR Technical Note TN-194+STR, Boulder, Colorado. Google Scholar
  10. Lefèvre, L., Clette, F.: 2014, Survey and merging of sunspot catalogs. Solar Phys. 289, 545. DOI. ADSCrossRefGoogle Scholar
  11. Lefèvre, L., Aparicio, A.J.P., Gallego, M.C., Vaquero, J.M.: 2016, An early sunspot catalog by Miguel Aguilar for the period 1914 – 1920. Solar Phys. 291, 2609. DOI. ADSCrossRefGoogle Scholar
  12. Leonardo, A.J.F., Martins, D.R., Fiolhais, C.: 2011, Costa Lobo and the study of the Sun in Coimbra in the first half of the twentieth century. J. Astron. Hist. Herit. 14, 41. ADSGoogle Scholar
  13. Mandal, S., Hegde, M., Samanta, T., Hazra, G., Banerjee, D., Ravindra, B.: 2017, Kodaikanal digitized white-light data archive (1921 – 2011): Analysis of various solar cycle features. Astron. Astrophys. 601, A106. DOI. ADSCrossRefGoogle Scholar
  14. Maunder, E.W.: 1904, Note on the distribution of Sun-spots in heliographic latitude, 1874 to 1902. Mon. Not. Roy. Astron. Soc. 64, 747. ADSCrossRefGoogle Scholar
  15. Mouradian, Z., Garcia, A.: 2007, Eightieth Anniversary of Solar Physics at Coimbra, The Physics of Chromospheric Plasmas ASP Conference Series 368, Astronomical Society of the Pacific, San Francisco. Google Scholar
  16. Owens, B.: 2013, Long-term research: Slow science. Nature 495, 300. DOI. ADSCrossRefGoogle Scholar
  17. Usoskin, I.G.: 2017, A history of solar activity over millennia. Living Rev. Solar Phys. 14, 3. DOI. ADSCrossRefGoogle Scholar
  18. Willis, D.M., Coffey, H.E., Henwood, R., Erwin, E.H., Hoyt, D.V., Wild, M.N., Denig, W.F.: 2013a, The Greenwich photo-heliographic results (1874 – 1976): Summary of the observations, applications, datasets, definitions and errors. Solar Phys. 288, 117. DOI. ADSCrossRefGoogle Scholar
  19. Willis, D.M., Henwood, M.N., Wild, M.N., Coffey, H.E., Denig, W.F., Erwin, E.H., Hoyt, D.V.: 2013b, The Greenwich photo-heliographic results (1874 – 1976): Procedures for checking and correcting the sunspot digital datasets. Solar Phys. 288, 141. DOI. ADSCrossRefGoogle Scholar
  20. Zolotova, N.V., Ponyavin, D.I., Marwan, N., Kurths, J.: 2009, Long-term asymmetry in the wings of the butterfly diagram. Astron. Astrophys. 503, 197. DOI. ADSCrossRefGoogle Scholar
  21. Zolotova, N.V., Ponyavin, D.I., Arlt, R., Tuominen, I.: 2010, Secular variation of hemispheric phase differences in the solar cycle. Astron. Nachr. 331, 765. DOI. ADSCrossRefGoogle Scholar

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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