## 6 Weddell Sea Anomaly
Figure 16a displays the latitude-longitude structures of the median TEC for December 2008 at universal times: 05 UT (uppermost plot), 06 UT (second from above plot), 07 UT (second from below plot), and 08 UT (bottom plot) while Figure 16b presents the respective reconstructed TEC plots arranged in the same way as in Figure 16a. The careful inspection reveals very high degree of similarity between the observed and the reconstructed global TEC at the considered UTs; actually, these are nighttime local times at longitudes where the WSA is observed. Furthermore, the quality of the reconstruction is assessed by the RMSE which are for the considered universal times from 05 to 08 UT, respectively 1.174; 1.161; 1.151 and 1.133. These really very small errors unambiguously confirm the excellent reconstruction where the investigated WSA clearly stands out. Figure 16c demonstrates the latitude-longitude structure of the WSA itself reconstructed by the superposition of D0 + SPW1 + DW2 + DE1 at the above-mentioned UTs, arranged in the same way as in Figure 16a; actually, the real WSA is situated at the western part of the southern middle and high latitudes. These plots reveal that on the average the WSA is centered at longitude around 90\({}^{\circ}\)W and latitude of 60\({}^{\circ}\) S. Based on this, Figure 17a shows the latitude-time structures of the nonmigrating tidal D0 (left plot) DW2 (middle plot) and DE1 (right plot) amplitude at latitude of 60\({}^{\circ}\) S and longitude of 90\({}^{\circ}\)W for December 2008. It is seen that these tides have large effect mainly between 3-4 UT and 8-9 UT (i.e., between 21-22 and 2-3 LT), as well as at the range of the WSA, where the largest amplitude has the D0 followed by DW2 and finally is DE1. Figure 17b displays the latitudinal dependence of the tidal and SPW1 contribution to the WSA production in December 2008 at the following universal times: 05 UT (left plot), 06 UT (second from the left plot), 07 UT (second from the right plot), and 08 UT (right plot). Certainly the D0 has the largest contribution to the production of the WSA followed by the SPW1, DW2; then, finally, is DE1. Furthermore, there is also a decrease in the contribution of D0 and a concomitant increase in the contribution of SPW1 and DW2 with increasing UTs. The last step in the analysis of the WSA is to check whether it is observed in our case in large statistics; this means we had to obtain the climatology of the distribution of the mean global TEC in December and January, which would show whether this anomaly is observed or not. While the results for December were definitely positive, in those for January, the WSA was hardly visible. Figure 18a produces the latitude-longitude structure of the climatological mean (2002-2022) TEC (left column of plots) and its full reconstruction (right column of plots) at universal times: 05 UT (uppermost plots), 06 UT (second from above plots), 07 UT (second from below plots), and 08 UT (bottom plots). Again, besides the high degree of similarity between both columns of plots, the reconstruction is assessed using the _RMSE_, which for the considered universal times from 05 to 08 UT are: 1.671, 1.607, 1.483, and 1.447, respectively. The results of Figure 18a clearly demonstrates the presence of the WSA in the climatologically (2002-2022) mean TEC in December, as well as the excellent reconstruction of this mean TEC assessed using the _RMSE_. Figure 18b shows the latitude-longitude structures of the climatological mean WSA itself (left column of plots), reconstructed by the superposition of the climatologically mean D0 + SPW1 + DW2 + DE1 and the latitudinal dependence of the contribution of these WSA components (right column of plots) at the above-mentioned UTs, arranged in the same way as in Figure 18a. In this case, the contribution of the DE1 is insignificant, while the contribution of the other components is the similar to that in December 2008.