Atmospheric temperature* | 3 - high | Inaccurate in low troposphere. | One directional antenna, one GNSS system tracked, covering about 250 soundings/day |
Geoid | 4 - fair | Highly indirect. | Radio-occultation processing implies precise orbitography. Geoid derived from multi-temporal analysis |
Gravity field | 5 - marginal | Highly indirect. | Radio-occultation processing implies precise orbitography. Gravity field derived from multi-temporal analysis |
Height of the top of PBL | 3 - high | No specific limitation. | One directional antenna, one GNSS system tracked, about 250 soundings/day. PBL top measured as discontinuity of the refraction index |
Height of the tropopause* | 3 - high | No specific limitation. | One directional antenna, one GNSS system tracked, about 250 soundings/day. Tropopause height measured as discontinuity of the refraction index |
Precipitation intensity at surface (liquid or solid) | 5 - marginal | Heavy precipitation only | Precipitation detected by de-polarisation measurement (experimental) |
Specific humidity* | 3 - high | Inaccurate in high troposphere. | One directional antenna, one GNSS system tracked, about 250 soundings/day |
Temperature of the tropopause | 3 - high | No specific limitation. | One directional antenna, one GNSS system tracked, about 250 soundings/day |
Wind speed (near surface)* | 5 - marginal | Infrequent coverage.. Over sea only. | Wind speed estimated from the intensity of signals from different incidence angles |
Atmospheric density* | 1 - primary | No specific limitation. | Measuring atmospheric density |
Electron Density* | 1 - primary | No specific limitation. | One directional antenna, one GNSS system tracked, about 250 soundings/day |
Ionospheric Total Electron Content (TEC)* | 3 - high | No specific limitation. | One directional antenna, one GNSS system tracked, about 250 soundings/day |
Ionospheric Scintillation | 4 - fair | No specific limitation. | One directional antenna, one GNSS system tracked, about 250 soundings/day |