Table 2 Comparison of the degree 360 anomaly estimates (nT) from the S360 and NGDC720 models over the study area in Fig. 4

Satellite altitude (320 km, 0.5° × 0.5° grid)

 B _r

20.64; −16.05

(20.64; −15.82)

0.31

(1.39)

4.95

(5.82)

21.00; −17.29

(21.00; −17.29)

0.04

(0.99)

4.96

(5.93)

0.984

(0.996)

0.910

(0.665)

 B _θ

15.94; −14.74

(14.21; −14.74)

0.02

(−0.17)

3.82

(4.43)

15.20; −15.08

(14.18; −15.08)

−0.10

(−0.45)

3.84

(4.47)

0.988

(0.998)

0.647

(0.388)

 B _φ

9.77; −7.56

(9.77; −7.41)

0.09

(0.18)

2.91

(3.40)

9.98; −8.58

(9.98; −7.03)

−0.03

(0.06)

2.97

(3.41)

0.974

(0.990)

0.685

(0.510)

Near surface (0.25° × 0.25°)

 ΔT

832.4; −455.0

(832.4; −455.0)

−1.99

(3.93)

95.8

(113.6)

871.8; −438.7

(765.5; −438.7)

−0.52

(4.08)

83.45

(101.3)

0.89

(0.97)

44.2

(27.7)