International Sunspot Number: graphics

Click on figures for full-size plots (graphics are updated every first of the month)


Daily, monthly and 13-month smoothed sunspot numbers for the past 13 years, and 12-month ahead predictions.

Monthly and 13-month smoothed sunspot numbers over the last 6 cycles.


Kalman filter improvement of the 12-month ahead Sunspot Number prediction by the standard curves method (SM) and by the Combined method (CM).

North and South hemispheric sunspot numbers (13-month smoothed values) over the last 6 cycles.


Kalman filter improvement of the 12-month ahead Sunspot Number prediction by the McNish&Lincoln method (M&L).

Maunder "butterfly" diagram, based on the Locarno sunspot group catalog.


Yearly mean and 13-month smoothed monthly sunspot number since 1700.