Fig. 4.From: An analysis of the scale height at the F2-layer peak over three middle-latitude stations in the European sectorVariation of the monthly median values of Hm in km, at El Arenosillo, for the four seasons (a) winter, (b) spring, (c) summer, (d) fall and for the high solar-activity year 2000 and for the low solar-activity year 2007.Back to article page