734280.fig.004a
(a)
734280.fig.004b
(b)
Figure 4: VTECU maps on October 19 and 22, 2001 at 19 UT showing the equatorial anomaly crests in the region close to Brazil for maximum values of VTECU (geographic equator in solid line and the magnetic equator in dashed line). Source: Produced by Leica Geosystems/GNSS QC software.