SILSO is part of ICSU World Data System. The Solar Influences Data Analysis Center (SIDC) is the solar physics research department of the Royal Observatory of Belgium. The SIDC includes the World Data Center for the sunspot index and the ISES Regional Warning Center Brussels for space weather forecasting. SIDC is one of the Regional Warning Centres of the International Space Environment Service (ISES).
re3data.org: WDC Sunspot Index and Long-term Solar Observations;
editing status 2016-10-07;
re3data.org - Registry of Research Data Repositories. http://doi.org/10.17616/R38322
last accessed: 2017-01-19