Fig. 6From: Simultaneous ground-based optical and SuperDARN observations of the shock aurora at MLT noonAuroral keograms in 557.7nm and 630.0nm wavelengths from YRS are presented in two panels between 09:00 and 10:00 UT. The left vertical axis gives the zenith angle from -90º(equatorward) to 90º(poleward), and corresponding magnetic latitude was shown in right vertical axis. The red vertical dashed line indicates the SI onset timeBack to article page