TEC Regional Map GNSS

Please Note:We are aware of issues with the TEC maps on this page. These plots are not functioning correctly. A fix is currently being investigated.

Updates: Every 15 minutes

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Back to: TEC Regional Map (comparison page)

This map shows the Total Electron Content (TEC) as measured by GPS recievers. The ionosphere is modelled as a thin shell at 400km in altitude and the point where the satellite-receiver line of sight passes through this shell is known as the Ionospheric Pierce Point (IPP). The TEC shown in each grid cell is averaged using all IPPs within that grid cell. Typically, with the GPS receiver network in use, there are several hundred IPPs available across the region at any given time.

For details on how the GPS data is turned into the smooth TEC map, see About TEC Mapping.