Fig. 2.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 Ebro, for the four seasons (winter, spring, summer and fall) and for the high solar-activity years (a) 2000, (b) 2001, and for the low solar-activity years (c) 2006 and (d) 2007.Back to article page