Table 2 Overview of which data subset constrained which part of the model. The cross refers to non-zero entries in the matrix of partial derivatives, whereas the circle refers to zeros. The SV data refer to the annual difference of the revised monthly means
Description of the model parameters | Non-polar satellite data | Polar satellite data | SV data | |||
|---|---|---|---|---|---|---|
Day | Night | Day | Night | |||
Internal field | Time-dependent (\(n \le 15\)) | \(\bigcirc\) | \(\hbox {X}^{1}\) | \(\bigcirc\) | \(\hbox {X}^{1}\) | X |
Static (\(16 \le n \le 50\)) | \(\bigcirc\) | X | \(\bigcirc\) | X | \(\bigcirc\) | |
External field | SM | \(\bigcirc\) | X | \(\bigcirc\) | X | \(\bigcirc\) |
GSM | \(\bigcirc\) | X | \(\bigcirc\) | X | \(\bigcirc\) | |
Euler angles | CHAMP | \(\bigcirc\) | X | \(\bigcirc\) | \(\bigcirc\) | \(\bigcirc\) |
Swarm-A | \(\bigcirc\) | X | \(\bigcirc\) | \(\bigcirc\) | \(\bigcirc\) | |
Swarm-B | \(\bigcirc\) | X | \(\bigcirc\) | \(\bigcirc\) | \(\bigcirc\) | |
CryoSat-2 FGM1 | X | X | \(\bigcirc\) | \(\bigcirc\) | \(\bigcirc\) | |
CryoSat-2 FGM2 | X | X | \(\bigcirc\) | \(\bigcirc\) | \(\bigcirc\) | |
CryoSat-2 FGM3 | X | X | \(\bigcirc\) | \(\bigcirc\) | \(\bigcirc\) | |
GRACE-A | X | X | \(\bigcirc\) | \(\bigcirc\) | \(\bigcirc\) | |
GRACE-B | X | X | \(\bigcirc\) | \(\bigcirc\) | \(\bigcirc\) | |
Calibration | CryoSat-2 FGM1 | X | X | X | X | \(\bigcirc\) |
CryoSat-2 FGM2 | X | X | X | X | \(\bigcirc\) | |
CryoSat-2 FGM3 | X | X | X | X | \(\bigcirc\) | |
GRACE-A | X | X | X | X | \(\bigcirc\) | |
GRACE-B | X | X | X | X | \(\bigcirc\) | |