Resolution No. 1 (2019): World Data Center SILSO and the international sunspot number

The International Association of Geomagnetism and Aeronomy (IAGA)

  • The importance of the long-running international sunspot number in an increasing number of studies into Solar Activity and related studies into Space Weather, Space Climate and Global Change in the Earth environment,


  • The leadership role of the World Data Center SILSO (Sunspot Index and Long-term Solar Observations) in the production, collection, preservation and dissemination of the international sunspot number over several decades,


  • Funding agencies to make every possible effort to continue the operation of the WDC-SILSO and the production of the International Sunspot Number in a long-term sustainable manner.
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