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Table 4. Product requirements for magnetic Level-2 products.

From: The Swarm Satellite Constellation Application and Research Facility (SCARF) and Swarm data products

Product Target Requirement Threshold Requirement
Core field (MCO), first time derivative (secular variation) at ground, n = 2-16, averaged over time 1 nT/yr 3 nT/yr
Lithospheric field (MLI), accumulated error at ground, n = 16–150 40 nT 120 nT
Ionospheric field (MIO), average relative error on ground 10% globally 10% at magnetic latitudes below ±55°
Magnetospheric field (MMA) Squared coherency coh2 > 0.8, though > 0.95 for n = 1 Squared coherency coh2 > 0.8, though > 0.75 for n = 1
Mantle conductivity (MIN) 1/2 order of magnitude error, though 1/4 order of magnitude at depths 400–1500 km 1 order of magnitude error, though 1/2 order of magnitude at depths 400–1500 km