Sunspot Observations and Counting at Specola Solare Ticinese in Locarno Since 1957

@article{Cortesi2016SunspotOA,
  title={Sunspot Observations and Counting at Specola Solare Ticinese in Locarno Since 1957},
  author={Sergio Cortesi and Marco Cagnotti and Michele Bianda and Renzo Ramelli and Andrea Manna},
  journal={Solar Physics},
  year={2016},
  volume={291},
  pages={3075-3080}
}
Specola Solare Ticinese is an observatory dedicated to sunspot number counting. It was constructed in 1957 in Locarno, Southern Switzerland, as an external observing station of the Zurich Federal Observatory. When the responsibility of the determination of the International Sunspot Number was assumed by the Royal Observatory of Belgium in 1981, Specola Solare Ticinese was given the role of pilot station, with the aim of preserving the continuity in the counting method. We report the observing… 
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