This page displays total electron content (TEC) in the ionosphere over Europe, as calculated from GPS data, using the MIDAS tomographic algorithm. It is updated continuously (with a lag of about half an hour, to allow for data acquisition and processing). Data is given in standard TEC units, equivalent to 1016 electrons per square meter.
Requires HTML5 Canvas support (e.g. Firefox 3.5 or higher, Internet Explorer 9 or higher, or Chrome 7 or higher).
Link to map at current time.
Download TEC file.