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

SILSO

Sunspot number series: latest update

Solar Cycle 25 maximum

Solar activity prediction from the WDC SILSO.

The Sun has been very active during the last few months. Since April this year, many large and complex sunspot groups have adorned the solar disk driving the daily sunspot number regularly to well above 250 (see the SIDC/USET image for 7 August underneath).