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Table 1 Summary of data selection criteria

From: A candidate secular variation model for IGRF-12 based on Swarm data and inverse geodynamo modelling

Magnetic Data type D st Kp Sun Local times
latitude Θ      
Θ≤52° scalar and vector ≤5 nT ≤2° ±10° all
Θ≥52° scalar ≤5 nT ≤2° ±10° 23:00–06:00