Real-time US-Total Electron Content: Vertical and Slant

Presented by the NOAA/Space Weather Prediction Center

Caution: Less than 30 stations currently available

Vertical Total Electron Content TEC uncertainty and GPS stations used in assimilation
Difference from 10 day average indicating recent trend  

Updated: 2016 Sep 19 1654 UTC     Data from a total of 25  real-time GPS stations from the CORS , GPS/Met, and IGS 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.

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