World Data Center for the production, preservation and dissemination of the international sunspot number

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Sunspot number series: latest update


Daily estimated sunspot number
15 October : 13
16 October : 12
17 October : 13
18 October : 18
19 October : 15

The new solar activity cycle.

December 2019 confirmed as starting point of the new solar activity cycle

December 2019 door Belgische wetenschappers bevestigd als start van de nieuwe zonnecyclus

Des scientifiques belges confirment que le nouveau cycle solaire a débuté en décembre 2019


December 2019 confirmed as starting point of the new solar activity cycle

The reference date and amplitudes of the minima and maxima of the 11-year solar cycle are established on the base of the sunspot number maintained and distributed by the SILSO World Data center since 1981 at the Royal Observatory of Belgium.

The reference date and amplitudes of the minima and maxima of the 11-year solar cycle are established on the base of the... more

Tue, 15 Sep 2020
Latest USET observations (ROB, Brussels) 19/10/2020

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