Fig. 10.
Observations of the 8 October 2012 eruption. (a) White-light CME (indicated by the white arrow) observed by STEREO COR2-A. (b) An inferred sigmoid (indicated by the dashed red line) in the 131 Å channel of AIA. (c) Twin EUV dimmings (marked by the two yellow arrows) seen in base difference 193 Å images. (d) One hooked flare ribbon (indicated by the black arrow) seen in the 1600 Å AIA channel.
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