Fig. 11.

Top panel: GCS modelling of the CME event on September 22, 2011, observed with the STEREO COR 2A (left panel) and STEREO COR 2B (right panel), which are positioned at ϕb = −97° and ϕa = 104° in HEE. Bottom panel: same event observed with the LASCO C3 coronagraph. During the eruption, a pre-existing coronal streamer increases in brightness and is deflected towards solar north pole – close to the POS of both COR2 coronagraphs.
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