Figure 14From: Geomagnetic observatory monthly series, 1930 to 2010: empirical analysis and unmodeled signal estimation Time evolution of the UMSL for all observatories. From left to right: X, Y, and Z components for all observatories (grey dots), with median values over all observatories (black), and 11-year running means of the median (red); (top) low to mid and (bottom) high geomagnetic latitudes.Back to article page