TEC Regional Map GNSS
Updates: Every 15 minutes
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.