From: COV-OBS.x2: 180 years of geomagnetic field evolution from ground-based and satellite observations
Parameter | \(\sigma _2^2\) (nT\(^2\)) | \(1/\alpha _2\) (year) | \(2\pi /\beta _2\) (year) | \(\sigma _1^2\) (nT\(^2\)) | \(1/\alpha _1\) (year) | \(\chi _C\) (nT\(^2\)) |
---|---|---|---|---|---|---|
\(C_2\) | \(23.3 \pm 1.2\) | \(41 \pm 4\) | \(10.51 \pm 0.03\) | – | – | 4.93 |
\(C_2 + C_1\) | \(19.6 \pm 0.8\) | \(56 \pm 5\) | \(10.51 \pm 0.02\) | \(16.7 \pm 1.3\) | \(5.9 \pm 0.7\) | 3.08 |