Fig. 4
CME front position (r2[t], ϕ2, σ2) determination using spacecraft observations (PSP or STEREO-A) from coordinates (r1, ϕ1, 0). We determined the CME kinematics by extracting the angles β and γ, knowing the spacecraft position, and assuming some constraints for the CME (such as a fixed angle or constant speed). Because of space constraints, we display ϕ2 − ϕ1 as ϕ21.
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