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 |