Table 1
The orbital characteristics of the satellites and the onboard instruments.
| Satellite | Mean altitude (km) | Orbital period (min) | TEC sampling rate (Hz) | Ne sampling rate (Hz) | Orbit |
|---|---|---|---|---|---|
| GRACE | 395 | 94.5 | 1/10 | 1 | Polar |
| SWC | 460 | 96 | 1 | 2 | Polar |
| SWB | 515 | 96 | 1 | 2 | Polar |
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