Figure 6From: Filtering ionosphere parameters to detect trends linked to anthropogenic effectsfoF2 residuals. foF2 residuals (MHz) estimated using Rz (black line) and F10.7 (red line) as solar EUV radiation proxies for (a) Slough, (b) Juliusruh, and (c) Sodankyla. Linear trends (dashed lines) are listed in Table 2.Back to article page