Phys.org  May 27, 2024 Researchers at the University of Michigan statistically studied large magnetic field vector residuals between Swarm observations and the 13th generation International Geomagnetic Reference Field (IGRF-13) model under quiet to moderate geomagnetic conditions. All large residuals appeared in the high latitude auroral zone region peaking around 70° magnetic latitude (MLAT) with a secondary occurrence peak just below 80° MLAT. However, the two hemispheres showed clear asymmetries in the magnetic longitude and magnetic local time distribution where both hemispheres showed high concentration of large residuals around the geographic poles. Since polar satellite’s orbits give rise to highly biased […]