Fig. 9.
Electron density and magnetic field environment through which the CME propagates. (a) Electron density map of the solar corona from the STEREO-A perspective. The green contours represent the 107 cm−3 density level and the white contours outline the CME density structure after a background map has been subtracted. (b) PFSS extrapolation from the photospheric magnetic field showing the coronal flux systems in the vicinity of the CME source region.
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