4325 20200213143409.0 CTALK-2019-0136 Lefèvre, Laure IAGA Resolution: International Sunspot Number: support to WDC SILSO 2019 2019-07-12 A IAGA resolution for the WDC-SILSO was voted after this presentation. STCE Clette, Frederic IUGG 2019, Montreal laure.lefevre@observatoire.be Invited CTALKCONT