The World Data Center SILSO has adopted an open data policy and our sunspot data can be freely downloaded (Licence: CC BY-NC : https://creativecommons.org/licenses/by-nc/4.0). However, we kindly request that proper credit to the WDC-SILSO is explicitely included in any publication using our data (paper article or book, on-line Web content, etc.).
We suggest as minimum short-format credit : "Source: WDC-SILSO, Royal Observatory of Belgium, Brussels, https://doi.org/10.24414/qnza-ac80". Or "Sunspot data from the World Data Center SILSO, Royal Observatory of Belgium, Brussels, https://doi.org/10.24414/qnza-ac80"..
In science papers, the source of data should be explicitly mentioned and referred to in the main text or figure captions. We recommend that you include an entry in the list of references, with the bibtex item as follows:
@misc{SILSO_Sunspot_Number, author = {{Clette}, F. and {Lefèvre}, L.}, title = {SILSO Sunspot Number V2.0}, doi = {10.24414/qnza-ac80}, howpublished = {https://doi.org/10.24414/qnza-ac80}, month = {07}, year = {2015}, note = {Published by WDC SILSO - Royal Observatory of Belgium (ROB)} }
