Coronagraph image Coronagraph image
Image of the solar corona, taken by the SECCHI outer coronagraph (COR2) on the STEREO Ahead observatory

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Note: The blue color on the difference image indicates the position of the leading edge.
The red color on the difference image indicates an approximate outline to the leading edge that was created using a segmentation technique.
Time_Diff - The time difference used in making the running difference image.
PAs - The position angles detection, each pair represents the starting and ending position angles of a CME.
Height - The height of each CME detection in the current frame corresponding to each position angle pair.