TY  - JOUR
A1  - Veronig, Astrid M.
A1  - Podladchikova, Tatiana
A1  - Dissauer, Karin
A1  - Temmer, Manuela
A1  - Seaton, Daniel B.
A1  - Long, David
A1  - Guo, Jingnan
A1  - Vrsnak, Bojan
A1  - Harra, Louise
A1  - Kliem, Bernhard
T1  - Genesis and Impulsive Evolution of the 2017 September 10 Coronal Mass Ejection
JF  - The astrophysical journal : an international review of spectroscopy and astronomical physics
N2  - The X8.2 event of 2017 September 10 provides unique observations to study the genesis, magnetic morphology, and impulsive dynamics of a very fast coronal mass ejection (CME). Combining GOES-16/SUVI and SDO/AIA EUV imagery, we identify a hot (T approximate to 10-15 MK) bright rim around a quickly expanding cavity, embedded inside a much larger CME shell (T approximate to 1-2 MK). The CME shell develops from a dense set of large AR loops ( greater than or similar to 0.5R(s)) and seamlessly evolves into the CME front observed in LASCO C2. The strong lateral overexpansion of the CME shell acts as a piston initiating the fast EUV wave. The hot cavity rim is demonstrated to be a manifestation of the dominantly poloidal flux and frozen-in plasma added to the rising flux rope by magnetic reconnection in the current sheet beneath. The same structure is later observed as the core of the white-light CME, challenging the traditional interpretation of the CME three-part morphology. The large amount of added magnetic flux suggested by these observations explains the extreme accelerations of the radial and lateral expansion of the CME shell and cavity, all reaching values of 5-10 km s(-2). The acceleration peaks occur simultaneously with the first RHESSI 100-300 keV hard X-ray burst of the associated flare, further underlining the importance of the reconnection process for the impulsive CME evolution. Finally, the much higher radial propagation speed of the flux rope in relation to the CME shell causes a distinct deformation of the white-light CME front and shock.
KW  - Sun: activity
KW  - Sun: corona
KW  - Sun: coronal mass ejections (CMEs)
KW  - Sun: flares
Y1  - 2018
U6  - https://doi.org/10.3847/1538-4357/aaeac5
SN  - 0004-637X
SN  - 1538-4357
VL  - 868
IS  - 2
PB  - IOP Publ. Ltd.
CY  - Bristol
ER  -