The material comes from http://www.ras.org.uk/news-and-press/2680-irregular-heartbeat-of-the-sun-driven-by-double-dynamo http://www.ras.org.uk/news-and-press/26

The material comes from http://www.ras.org.uk/news-and-press/2680-irregular-heartbeat-of-the-sun-driven-by-double-dynamo http://www.ras.org.uk/news-and-press/2680-irregular-heartbea... , with the more prosaic title "Irregular heartbeat of the Sun driven by double dynamo".