Table 1 Residual statistics for all data used to produce the ASM-V and VFM twin parent models
N | ASM-V (ASM-V data) | VFM twin (VFM data) | ||||
|---|---|---|---|---|---|---|
Mean (nT) | RMS (nT) | Mean (nT) | RMS (nT) | |||
Alpha + Bravo | \(F\) | 313,601 | − 0.07 | 3.87 | − 0.07 | 3.87 |
\(F\) and \({B}_{B}\) | 1,653,773 | + 0.03 | 2.55 | + 0.01 | 2.53 | |
\({B}_{B}\) | 1,340,172 | + 0.05 | 2.19 | + 0.03 | 2.16 | |
\({B}_{r}\) | 1,340,172 | − 0.01 | 2.16 | − 0.01 | 1.55 | |
\({B}_{\theta }\) | 1,340,172 | + 0.06 | 3.31 | + 0.02 | 2.92 | |
\({B}_{\varphi }\) | 1,340,172 | − 0.01 | 2.86 | + 0.01 | 2.48 | |
Alpha | \(F\) | 157,073 | − 0.17 | 3.98 | − 0.18 | 4.00 |
\(F \mathrm{and }{B}_{B}\) | 823,580 | + 0.01 | 2.60 | − 0.01 | 2.59 | |
\({B}_{B}\) | 666,507 | + 0.05 | 2.21 | + 0.03 | 2.19 | |
\({B}_{r}\) | 666,507 | + 0.01 | 2.23 | + 0.01 | 1.58 | |
\({B}_{\theta }\) | 666,507 | + 0.03 | 3.34 | + 0.03 | 2.93 | |
\({B}_{\varphi }\) | 666,507 | − 0.01 | 2.88 | − 0.00 | 2.48 | |
Bravo | \(F\) | 156,528 | + 0.03 | 3.75 | + 0.04 | 3.75 |
\(F\) and \({B}_{B}\) | 830,193 | + 0.05 | 2.51 | + 0.03 | 2.48 | |
\({B}_{B}\) | 673,665 | + 0.06 | 2.17 | + 0.03 | 2.13 | |
\({B}_{r}\) | 673,665 | − 0.04 | 2.08 | − 0.04 | 1.51 | |
\({B}_{\theta }\) | 673,665 | + 0.09 | 3.29 | + 0.01 | 2.91 | |
\({B}_{\varphi }\) | 673,665 | − 0.01 | 2.84 | + 0.02 | 2.49 | |