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Progress in Earth and Planetary Science
Fig. 5 | Progress in Earth and Planetary Science

Fig. 5

From: Coupled investigations of ionosphere variations over European and Japanese regions: observations, comparative analysis, and validation of models and facilities

Fig. 5

Relative variations of incoherent scatter power δP (a) measured by KhISR at the altitude of 200 km (left) and MUR at the altitude of 220 km (right) as well as corresponding results of spectral analysis (b) and band-pass filtering (c). Subfigure (b) contains a power spectral density S indicated by color level plotted vs time and period as well as average power E plotted vs period. Both S and E values were normalized to their maximums. Subfigure (c) shows altitude-time plots of δP band-pass filtered in the range of 40–80 min and 60–120 min for KhISR and MUR data, respectively. The solid lines mark the time of local sunrise and sunset terminator passage at the current altitude. LT is solar apparent time

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