Fig. 7.
Left panel: STEREO-A/EUVI 195 Å image of the corona before the eruption. A coronal hole (CH) is clearly visible in the southern hemisphere. Right panel: cartoon showing the proposed geometry involved in the type II emission at three times during the shock evolution. The type II emission is attributed to the interaction of the transmitted (green star) and reflected (light blue star) shock surface with a narrow low-Alfvén-speed region near the equator.
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