US-Total Electron Content Product (USTEC)

The US Total Electron Content (US-TEC) product is designed to specify TEC over the Continental US (CONUS) in near real-time. The product uses a Kalman Filter data assimilation model, described in the Technical Documentation. This technique is driven by data from ground-based Global Positioning System (GPS) dual frequency receivers. The primary data stream comes from the Maritime and Nationwide Differential GPS (M/NDGPS) real time network of stations operated by the US Coast Guard (USCG). As of January 2006, there were about 130 stations ingested into the model. This number has been gradually increasing and will be augmented by Federal Aviation Administration/Wide Area Augmentation System (FAA/WAAS) data, and new stations in areas with poor coverage. This product has evolved through a collaboration between the Space Weather Prediction Center (SWPC), the National Geodetic Survey (NGS), the NOAA National Centers for Environmental Information (formerly National Geophysical Data Center), and the Global Systems Division (GSD).
Search Data
Download Data
Distribution Formats
  • PNG Plots
Distributor Distributor information not available
Dataset No POCs available for this dataset
Time Period 2004-10-14 to Present
Spatial Bounding Box Coordinates
N: 60
S: 10
E: -50
W: -150
Spatial Coverage Map
General Documentation
Publication Dates
  • publication: 2006-04-01
Dataset Progress Status Under development - data is currently in the process of being created
Data Update Frequency Daily
Supplemental Information
Purpose The product is designed for single and dual frequency GPS applications. The TEC and slant path maps can be used to estimate the GPS signal delay due to the ionospheric electron content between a receiver and a GPS satellite. Of particular interest to users is the link to Data files which provides not only tabular values of the total electron content, but also values of line-of-sight (LOS) or slant path electron content to each GPS satellite in view over the CONUS. For each GPS satellite in view the LOS maps provide 1 degree x1 degree two-dimensional grids over the CONUS.
Use Limitations
  • None
  • DOC/NOAA/NWS/NCEP/SWPC > Space Weather Prediction Center, National Centers for Environmental Prediction, National Weather Service, NOAA, U.S. Department of Commerce
    Publisher information not available.
Theme keywords NASA/GCMD Earth Science Keywords
  • Earth Science > Sun-Earth Interactions > Ionosphere/Magnetosphere Particles
  • Earth Science > Sun-Earth Interactions > Solar Energetic Particle Properties > Total Electron Content
    Use Constraints
    • Use Constraints: none
    Access Constraints
    • Access Constraints: none
    • Free download availability
    Acquisition Information (collection)
    • Global Positioning System
    • GPS > Global Positioning System
    • The TEC and slant path maps can be used to estimate the GPS signal delay due to the ionospheric electron content between a receiver and a GPS satellite
    Last Modified: 2015-09-18
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