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

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 assume...

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Bibliographic Details
Published in:Solar physics 2016-11, Vol.291 (9-10), p.3075-3080
Main Authors: Cortesi, Sergio, Cagnotti, Marco, Bianda, Michele, Ramelli, Renzo, Manna, Andrea
Format: Article
Language:English
Subjects:
Astrophysics and Astroparticles
Atmospheric Sciences
Continuity
Physics
Physics and Astronomy
Pilots
Solar cycle
Solar physics
Space Exploration and Astronautics
Space Sciences (including Extraterrestrial Physics
Stations
Statistics
Sunspot Number Recalibration
Sunspots
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Summary: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 procedure and counting rules applied in Locarno.
ISSN:0038-0938
1573-093X
DOI:10.1007/s11207-016-0872-7