Monthly Smoothed Sunspot Number
Cycle 23-24

Last updated: 6 January 2010

Notes:

• This graph is based on the SIDC Brussels International Sunspot Number.
• Sunspot numbers are smoothed over a twelve-month period, and indicated at the mid-point of each period. Therefore the latest smoothed figure will be for a point six months prior to the latest monthly figure.

Go to http://www.swpc.noaa.gov/SolarCycle/ for the NOAA / Space Weather Prediction Center's current predictions and graph, updated monthly.

To get a more current look at what is happening (or not!), the following graph shows daily figures combined with 30-day and 90-day averages up to the current date.

This graph last updated: 6 January 2010