Measurements of Earth’s magnetic field have been ongoing at the Leirvogur Magnetic Observatory in Mosfellsbær, Iceland, since 1957.
The graph shows a record of magnetic disturbances as measured at Leirvogur for the past 24 hours. It is updated every 10 minutes. When the graphs start moving, solar wind is rattling the magnetic field of the Earth which is usually follow by outbursts of aurora activity. So, keep an eye on the graph.
The graph is used to calculate a K-index over three hour intervals. The table below shows a record of measured K-index in Leirvogur.