http://www.solarham.com/magnetogram.htm
The Kiruna magnetogram provides realtime data of the local Earth magnetic field at ground level. Strong deviations in the data, primarily the black line could signal the development of geomagnetic activity. The curves on this plot show deflections from an average. The average is derived from the monthly means of the five most quiet days. For more data and information, visit the website below.
Swedish Institute of Space Physics http://www.irf.se/
Kiruna Magnetogram http://www.irf.se/mag/
