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Table 1 Overview of various datasets for which the 3-D conductivity inversion is attempted

From: Lateral variations of electrical conductivity in the lower mantle constrained by Swarm and CryoSat-2 missions

Model Max. ext. degree/order Max. int. degree/order Time sampling Series length Data source Data selection Comment
0501 2/2 3/3 1.5 h/6 h 5 year O,S   Official ESA product
0502 2/1 3/3 1.5 h/6 h 5 year O,S   
0503 2/2 + 3/0 3/3 1.5 h/6 h 5 year O,S   
0513 2/2 + 3/0 3/3 1.5 h/6 h 5 year O,S,C   CUP20-OSC5
0601 2/2 3/3 1.5 h/6 h 6 year O,S DW55GM  
0602 2/2 3/3 1.5 h/6 h 6 year O,S R50  
0603 2/2 3/3 1.5 h/6 h 6 year O,S DW50  
0604 2/2 + 3/0 3/3 1.5 h/6 h 6 year O,S DW55 CUP20-OS6
0605 2/2 + 3/0 3/3 1.6 h/8 h 6 year O,S DW55  
0606 2/2 + 3/0 3/3 1.5 h/12 h 6 year O,S DW55  
0612 2/2 3/3 1.5 h/6 h 6 year O,S NS, R55  
0613 2/2 3/3 1.5 h/6 h 6 year O,S NS, R55, NI  
  1. The datasets vary by the truncation degree and order of the external field, time sampling (the first value corresponds to the external and internal dipole terms 1/0, the second value to all other terms), the length of series, the inclusion of observatory, Swarm, and CryoSat-2 data (O, S, and C, respectively), and data selection. DW55GM: data polewards of dipole latitude \(55^\circ\) down-weighted by \(\sin (\vartheta _{GM})/100\); DW50, DW55: data polewards of dipole latitude \(50^\circ\) or \(55^\circ\) down-weighted by \(\sin (\vartheta _{GC})/100\); R50, R55: data polewards of dipole latitude \(50^\circ\) or \(55^\circ\) removed, NS: only night-side data, when the Sun is at least \(10^\circ\) below horizon are used; NI: the comprehensive model of the ionosphere is not subtracted from data. \(\vartheta _{GM}\) and \(\vartheta _{GC}\) stand for geomagnetic (dipole) and geocentric colatitudes, respectively