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The X8.2 event of 10 September 2017 provides unique observations to study thegenesis, magnetic morphology and impulsive dynamics of a very fast CME.Combining GOES-16/SUVI and SDO/AIA EUV imagery, we identify a hot ($T\approx10-15$ MK) bright rim around a quickly expanding cavity, embedded inside a muchlarger CME shell ($T\approx 1-2$ MK). The CME shell develops from a dense setof large AR loops ($\gtrsim$0.5 $R_s$), and seamlessly evolves into the CMEfront observed in LASCO C2. The strong lateral overexpansion of the CME shellacts as a piston initiating the fast EUV wave. The hot cavity rim isdemonstrated to be a manifestation of the dominantly poloidal flux andfrozen-in plasma added to the rising flux rope by magnetic reconnection in thecurrent sheet beneath. The same structure is later observed as the core of thewhite light CME, challenging the traditional interpretation of the CMEthree-part morphology. The large amount of added magnetic flux suggested bythese observations explains the extreme accelerations of the radial and lateralexpansion of the CME shell and cavity, all reaching values of $5 - 10$ kms$^{-2}$. The acceleration peaks occur simultaneously with the first RHESSI$100-300$ keV hard X-ray burst of the associated flare, further underlining theimportance of the reconnection process for the impulsive CME evolution.Finally, the much higher radial propagation speed of the flux rope in relationto the CME shell causes a distinct deformation of the white light CME front andshock.

Genesis and impulsive evolution of the 2017 September 10 coronal mass ejection