Fig. 3From: Local empirical model of ionospheric plasma density derived from Digisonde measurements at IrkutskDiurnal-seasonal variations of the slope of the linear dependence on F10.7, NmF2D in [105 cm−3/100 s.f.u.] for LEMI (a) and IRI (b). The high and low values are depicted by the solid and dashed contours, respectively.Back to article page