Fig. 1From: Correlation analysis of field-aligned currents from the magnetic measurements of GRACE follow-on missionThe (top) altitude, (middle) LT coverage and (bottom) time lag between GF1 (black) and GF2 (red) when they fly over the geographic equator. The thicker and thinner lines represent the ascending and descending orbits, respectively. GF2 is plotted over GF1. The line is, therefore, black if GF2 data were not availableBack to article page