Using TNT-NN to unlock the fast full spatial inversion of large magnetic microscopy data sets

Earth, Planets and Space

Table 3 Summary of the unidirectional ferromanganese crust inversion parameters and results

Method	Scenario	P	Q	m (Am\(^2\))	Residual RMS (nT)
TNT-NN	1	96621	24000	\(4.85\times 10^{-8}\)	\(2.48\times 10^{-1}\)
lsqlin	2	55671	21600	4.38\(\times 10^{-8}\)	\(5.72\times 10^{-1}\)
TNT-NN	2	55671	21600	\(4.38\times 10^{-8}\)	\(3.56\times 10^{-1}\)
TNT-NN	3	96621	37600	\(4.85\times 10^{-8}\)	\(2.35\times 10^{-1}\)
Hysteresis	–	–	–	\(7.52\times 10^{-8}\)	–

The first column shows the method used to obtain results: the numerical method or hysteresis (shown in the final row). The second column shows the scenario with which the parameters and results are associated. The third column, P, is the number of sample points collected by the scanning SQUID microscope. The fourth column, Q, is the number of dipoles in the solution of each inversion. The fifth and sixth columns give the unidirectional orientation of the dipoles as used for NNLS analysis. The seventh column lists the moment, m. The final column provides the residual RMS of the NNLS fits with the B\(_z\) field. Hysteresis data were obtained from Noguchi et al. (2017b, Table S1)