Fig. 6.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, Ebro and Pruhonice, for the four seasons: (a) winter, (b) spring, (c) summer, (d) fall for the low solar-activity year 2007.Back to article page