Table 2.
Parameter estimates for the AXING-need (ν = 3), Gau-need and Gau–Matérn models applied to the small-scale component of the high-latitude ionospheric electrostatic potential at the first time point. The corresponding standard errors are shown in parentheses. Note that η0 is fixed at 0 for the AXING-need and Gau-need models
| Model | AXING-need | Gau-need | Gau-Matérn |
|---|---|---|---|
| η0 | 0 (−) | 0 (−) | −2.037 (0.16) |
| η1 | 0.949 (0.036) | 0.959 (0.011) | 0.659 (0.10) |
| η2 | 1.579 (0.086) | 1.619 (0.012) | 1.372 (0.29) |
| η3 | −1.209 (0.046) | −1.190 (0.012) | −1.078 (0.070) |
| σ2 | 0.148 (0.023) | 0.252 (0.014) | - |
| σ3 | 0.0363 (0.0035) | 0.0665 (0.0032) | - |
| σ4 | 4.09e-3 (2.62e-4) | 6.47e-3 (2.11e-04) | - |
| κ | - | - | 2.857 (0.14) |
| 1/a | - | - | 0.102 (0.0072) |
| τ | 0.0280 (3.71e-04) | 0.0282 (3.18e-04) | 7.76e-03 (1.16e-04) |