Real-time US-Total Electron Content: Vertical and Slant
TEC uncertainty and GPS stations used in assimilation
2014 Jul 29 2015 - 2030 UTC
Updated: 2014 Jul 29 2042 UTC
Data from a total of
GPS stations from the
networks are used for these calculations.
US-TEC provides vertical TEC and slant path values of the line-of-sight
electron content to the GPS satellites in view at the time. Note that TEC values in regions outside of the CONUS have no data and should
be treated with caution. This ionospheric product is designed to
estimate the signal delay for single and dual frequency GPS applications. US-TEC
products are provided for today and yesterday, prior to yesterday
please go to NGDC.