Sunspot data collection of Specola Solare Ticinese in Locarno

@article{Ramelli2018SunspotDC,
  title={Sunspot data collection of Specola Solare Ticinese in Locarno},
  author={Renzo Ramelli and Marco Cagnotti and Sergio Cortesi and Michele Bianda and Andrea Manna},
  journal={Proceedings of the International Astronomical Union},
  year={2018},
  volume={13},
  pages={129 - 132}
}
Abstract Sunspot observations and counting are carried out at the Specola Solare Ticinese in Locarno since 1957 when it was built as an external observing station of the Zurich observatory. When in 1980 the data center responsibility was transferred from ETH Zurich to the Royal Observatory of Belgium in Brussels, the observations in Locarno continued and Specola Solare Ticinese got the role of pilot station. The data collected at Specola cover now the last 6 solar cycles. The aim of this… 
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