Fig. 11From: Statistical analysis of ionospheric mid-latitude trough over the Northern Hemisphere derived from GPS total electron content dataA comparison of trough positions derived from GPS-TEC (right panels) with TEC trough positions generated by the IRI model (left panels), as a function of MLT (upper panels), and as a function of F107 in winter (lower panels). The red, black, and blue lines in the upper panels denote the results for the summer, winter, and equinox seasons, respectivelyBack to article page