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Ionosphere Total Electron Content (TEC) Map

Affected by solar activity, Total Electron Content (TEC) describes the total number of free electrons present within one square meter between two points (i.e. between the receiver and satellite). The larger the TEC quantity, the longer the delay in a received GNSS signal.


The map below shows the latest image of TEC values and is updated every five minutes.


Click here to download the ionosphere map in 3D for Google Earth.