000008036 001__ 8036
000008036 005__ 20260227172639.0
000008036 037__ $$aPOSTER-2026-0058
000008036 100__ $$aLefèvre, Laure
000008036 245__ $$aImproving the Sunspot Number and Group Number series : how and when ? 
000008036 260__ $$c2025
000008036 269__ $$c2025-10-27
000008036 520__ $$aEfforts have been undertaken by the solar community since 2010 to revise both the Sunspot Number and the Group Number series (SN and GN). I will present our latest achievements and our plans for the near future.  First, since the last revision of SN in 2015, significant progress has been made in recovering and digitizing historical datasets, notably including the Mittheilungen from the Zürich Observatory. These recovered records enabled a new reconstruction of the SN series from 1814 to 1944 (Bhattacharya et al., 2022, 2023, 2024), and also led to several revised Group Number reconstructions (e.g. Svalgaard & Schatten 2016, Chatzistergos et al. 2017, Usoskin et al. 2021). Furthermore, in 2022, the WDC-SILSO team launched the FARSUN project, aiming to collect, harmonize, and centralize all available sunspot datasets into a single FAIR-compliant (Findable, Accessible, Interoperable, and Reusable) database hosted in Belgium. Second, if we look at the modern production of the SN and GN, in 2023, the WDC-SILSO launched a project to modernize the day-to-day computation of the SN, and add the production, at the same frequency, of the GN (Belgian SUNRISE).  In summary, in the near future, by mid-2027, a historical database centralizing all available sunspot data will be put into action, and will keep being updated as new data is digitized. By the same time, the production of the SN will be modernized and GN will be produced by the WDC-SILSO with the same frequency as SN. At this time, new major versions of SN and GN will be released with complete transparency as to their construction. 
000008036 536__ $$aFARSUN - SUNRISE/$$cFARSUN - SUNRISE/$$fFARSUN - SUNRISE
000008036 594__ $$aSTCE
000008036 700__ $$aKalugodu, Chandrashekhar
000008036 700__ $$aMampaey, Benjamin
000008036 773__ $$tESWW25, Umea
000008036 8560_ $$flaure.lefevre@ksb-orb.be
000008036 8564_ $$s1861419$$uhttps://publi2-as.oma.be/record/8036/files/SNGN_Poster_LLefevre_ESWW25.pdf
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000008036 980__ $$aCPOSTER