European Space Agency, GFZ Helmholtz Centre for Geosciences, 2014, "SW_TECxTMS_2F", European Space Agency, https://doi.org/10.57780/esa-b579355
| Variable | Units | Description | Dim | Type |
|---|---|---|---|---|
| Timestamp | ms | Time stamp in UTC | 1 | CDF_EPOCH |
| Latitude | degree | Geographic latitude | 1 | CDF_DOUBLE |
| Longitude | degree | Geographic longitude | 1 | CDF_DOUBLE |
| Radius | km | Geographic radius | 1 | CDF_DOUBLE |
| GPS_Position | km | X-,Y-,Z-coordinates (WGS84) of the GPS satellite | 3 | CDF_DOUBLE |
| LEO_Position | m | X-,Y-,Z-coordinates (WGS84) of the LEO satellite | 3 | CDF_DOUBLE |
| PRN | - | GPS satellite PRN | 1 | CDF_UINT2 |
| L1 | m | GPS L1 carrier phase observation | 1 | CDF_DOUBLE |
| L2 | m | GPS L2 carrier phase observation | 1 | CDF_DOUBLE |
| P1 | m | GPS P1 code phase observation | 1 | CDF_DOUBLE |
| P2 | m | GPS P2 code phase observation | 1 | CDF_DOUBLE |
| S1 | - | GPS signal-to-noise ratio or raw signal strength on L1 | 1 | CDF_DOUBLE |
| S2 | - | GPS signal-to-noise ratio or raw signal strength on L2 | 1 | CDF_DOUBLE |
| Absolute_STEC | TECU | Absolute slant TEC | 1 | CDF_DOUBLE |
| Absolute_VTEC | TECU | Absolute vertical TEC | 1 | CDF_DOUBLE |
| Elevation_Angle | degree | Elevation Angle | 1 | CDF_DOUBLE |
| Relative_STEC | TECU | Relative slant TEC | 1 | CDF_DOUBLE |
| Relative_STEC_RMS | TECU | Root mean square error of relative slant TEC | 1 | CDF_DOUBLE |
| DCB | TECU | GPS receiver differential code bias | 1 | CDF_DOUBLE |
| DCB_Error | TECU | Error of the GPS receiver differential code bias | 1 | CDF_DOUBLE |
| Product identifier | TECxTMS_2F |
| Definition | Time series of the ionospheric total electron content |
| Input data | GPS RINEX observation and navigation files (GPSX_RO_1B), Swarm satellite ephemeris (MODX_SC_1B) GPS and Swarm satellite ephemeris (AUX_GPSEPH) GPS transmitter biases(AUX_DCB_2F) Leap seconds (AUX_USLEAP) |
| Input time span | 3 days |
| Spatial representation | Line representation of GPS –Swarm link |
| Time representation | 1-s time series for TEC and 1 day for DCB |
| Units | TECU (1016 electrons/m2) |
| Resolution | 1E-8 TECU |
| Uncertainty | 2 TECU |
| Quality indicator | Relative_STEC_RMS (RMS deviation between code and carrier phases) and DCB_Error |
| Data volume | ~4 MB / day / satellite |
| Output data | CDF file with time series |
| Output time span | 1 day |
| Latency | 6 min |
| Update rate | 1 per day |
| Notes | The cadence of the TECxTMS_2F data has changed from 10-s (0.1 Hz) to 1-s (1 Hz) at: 2014-07-14 06:42:59 for Swarm A 2014-07-14 06:06:46 for Swarm B 2014-07-14 08:15:59 for Swarm C It is recommended to use absolute VTEC data with corresponding elevation angles of the GPS rays of at least 50°. |