Fig. 1From: Vertical fine structure and time evolution of plasma irregularities in the Es layer observed by a high-resolution Ca+ lidarTime-height cross section of Ca+ densities observed by the resonance scattering lidar at Tachikawa on December 24, 2014. The irregular structures surrounded by red boxes were enlarged and shown in Figs. 3, 4, 5, and 6Back to article page