Fig. 6From: Statistical analysis of ionospheric mid-latitude trough over the Northern Hemisphere derived from GPS total electron content dataThe trough minimum position versus F107 under a low (1.5 ≤ Kp ≤ 2.5) geomagnetic activity condition. The left, middle, and right panels show the results for the summer, equinox, and winter seasons, respectivelyBack to article page