Open Access
Table 1
Data used in the construction DTM2020 (ρ is total density), and assessment of the CIRA models.
| Measurement | Period | Used in DTM2020 | |
|---|---|---|---|
| CHAMP | ρ | 01/2001 – 09/2010 | Operational, research |
| GRACE | ρ | 08/2002 – 12/2016 | Operational, research |
| GOCE | ρ | 11/2009 – 11/2013 | Operational, research |
| Swarm A | ρ | 11/2013 – 02/2016 | Operational, research |
| Stella | ρ | 01/2000 – 12/2019 | Operational, research |
| Starlette | ρ | 01/2000 – 12/2016 | No |
| TLE 250/325 km | ρ | 01/1967 – 08/2013 | Operational, research* |
| HASDM database | ρ | 01/2000 – 12/2019 | No |
| SETA2 | ρ | 05/1982 – 11/1982 | No |
| SETA3 | ρ | 07/1983 – 03/1984 | No |
| AE-C MESA | ρ | 12/1973 – 09/1976 | No |
| AE-E MESA | ρ | 12/1975 – 01/1978 | No |
| DE-2** | T, He, O, N2 | 08/1981 – 02/1983 | Operational |
| AE-C | N2 | 01/1974 – 04/1977 | Operational |
| AE-E | T, O | 12/1975 – 05/1981 | Operational |
| EDR | ρ | 1/2000 – 12/2010 | No |
| SUSIM*** | O2 | 10/1991 – 2/2005 | Operational |
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