This applet displays total electron content (TEC) in the ionosphere, 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). See the space weather page for more information about the science behind these reconstructions. See also the simple image based version.

Requires Java Run-time Environment version 1.6, or higher.

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Date: Time:

Frames: Position: Interval:

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TEC file specifications

Acknowledgements

GPS data courtesy of:
- The EUREF network.
- The Ordnance Survey.
- The International GNSS Service.
Sky-map image courtesy of NASA/Goddard Space Flight Center Scientific Visualization Studio.
Earth surface image courtesy of Marketing Den.
Astronomical algorithms courtesy of the US Naval Observatory.