000006034 001__ 6034
000006034 005__ 20230106154418.0
000006034 037__ $$aCTALK-2023-0002
000006034 100__ $$aClette, Frédéric
000006034 245__ $$aSunspot number, group number and F10.7: new insights
000006034 260__ $$c2022
000006034 269__ $$c2022-09-19
000006034 520__ $$aSince the first major revision of the sunspot number series in 2015, further analyses have been conducted and new original data have been retrieved and revisited, in view of an upcoming improved version (3.0). We will summarize here the recent advances, including the construction of the database of the Zurich source data, and the specific studies of key observers: Carrington, Schwabe and Wolfer, who mark key transitions in the construction and calibration of the sunspot number. We will also briefly compare this new series with the parallel group number series, for which several incompatible versions still co-exist. By providing a revised reference, Version 2 of the sunspot number series already led to various implications for solar cycle forecasts, and also for other solar activity and geomagnetic activity indices. We will describe in particular new findings regarding the properties and homogeneity of the F10.7cm radio flux, which were enabled by the higher accuracy of the new sunspot number series. This includes the detection of a 10% scale jump in this reference radio flux in 1980. The sunspot number series, our longest record of solar activity, can thus still bring new insights on the evolution of the solar cycle, presently and over the coming years, now that its end-to-end upgrade has become a continuous process.
000006034 594__ $$aSTCE
000006034 700__ $$aLefèvre, Laure
000006034 700__ $$aBhattacharya, Shreya
000006034 773__ $$tSpace Climate 8 symposium: Climate in space and on Earth, Krakow, Poland
000006034 8560_ $$ffrederic.clette@observatoire.be
000006034 85642 $$ahttps://spaceclimate8.uph.edu.pl/
000006034 906__ $$aInvited
000006034 980__ $$aCTALKINVI