Solar activity since 1955

Mean sunspot number

2010

2000

1990

1980

1970

1960

Sunspots

0

100

200

300

2010

2000

1990

1980

1970

1960

Mean sunspot number

Sunspots

0

100

200

300

Guardian graphic | Source: WDC-SILSO, Royal Observatory of Belgium. Image: SDO/HMI