2.3.1 spase://CNES/NumericalData/CDPP-AMDA/SWARM-C/GNSS/swarmc-gps-all tec total electron content 2018-09-25T17:00:17Z The signals transmitted by the Global Navigation Satellite System (GNSS) satellites are delayed by ionospheric/plasmaspheric electrons before reaching the Swarm GNSS antenna. From the GNSS signal delay we can estimate slant total electron content (STEC), which is defined as ‘integrated’ electron density along the line of sight from Swarm to GNSS satellites. spase://CNES/Person/R.Haagmans ProjectScientist TEC dataset description https://earth.esa.int/web/guest/document-library/browse-document-library/-/article/swarm-level-2-tec-product-description spase://SMWG/Repository/CNES/CDPP-AMDA Online Open AMDA at CDPP http://amda.cdpp.eu NetCDF ftp://swarm-diss.eo.esa.int Level2daily/Entire_mission_data/TEC spase://CNES/Instrument/CDPP-AMDA/SWARM-C/GNSS 2001-01-07T05:14:25Z 2018-05-01T07:04:00Z PT1S Earth.Magnetosphere It is recommended to use absolute VTEC data with corresponding elevation angles of the GPS rays of at least 50◦ . The recommendation is given since the uncertainty of the mapping function increases with decreasing elevation angle. Note that AMDA keeps STEC / VTEC data for the highest elevation angle only. stec swc_stec Absolute slant TEC from largest elevation GNSS satellite TECU TimeSeries vtec swc_vtec Absolute vertical TEC from largest elevation GNSS satellite TECU TimeSeries relative stec swc_stec_rel Relative slant TEC TECU TimeSeries gps elevation angle swc_gps_elev gps elevation angle deg TimeSeries gps number swc_gps_number gps number TimeSeries