Cross Spectral Analysis of CODAR-SeaSonde Echoes from Sea Surface and Ionosphere at Taiwan

Figure 3

Two examples comparing coherences between sea echoes (symbols in red and green) and ionospheric echoes (symbols in black), in which red (green) symbols represent the coherences of the sea echoes computed from the negative (positive) Doppler spectral components and black symbols signify the coherences of the ionospheric echoes calculated from a Doppler spectral band from −0.2 Hz to 0.2 Hz.