Real-time US-Total Electron Content: Vertical and Slant
Difference from 10 day average indicating recent trend
2014 Nov 28 2000 - 2015 UTC
Updated: 2014 Nov 28 2027 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.