Table 1 Magnetic latitude boundaries for each of the five regions de-noised separately using PCA
Region | Magnetic latitude | N | K | Variance in kth PC (%) | Total (%) |
|---|---|---|---|---|---|
Polar North | \(70^{\circ } \le \lambda _m \le 90^{\circ }\) | 11 | 4 | 32.7, 28.6, 16.7, 5.3 | 83.3 |
Auroral North | \(50^{\circ } \le \lambda _m < 70^{\circ }\) | 30 | 3 | 68.6, 7.8, 6.3 | 82.7 |
Low/Mid Lats | \(-50^{\circ } \le \lambda _m < 50^{\circ }\) | 216 | 4 | 69.3, 9.3, 5.2, 3.9 | 87.7 |
Auroral South | \(-70^{\circ } \le \lambda _m < -50^{\circ }\) | 33 | 3 | 61.8, 10.5, 5.9 | 78.2 |
Polar South | \(-90^{\circ } \le \lambda _m < -70^{\circ }\) | 10 | 4 | 30.7, 24.1, 15.3, 13.0 | 83.1 |