Evolution of a streamer-blowout CME as observed by imagers on Parker Solar Probe and the Solar Terrestrial Relations Observatory

Context: On 26-27 January 2020, the wide-field imager WISPR on Parker Solar Probe (PSP) observed a coronal mass ejection (CME) from distance of approximately 30 solar radii as it passed through instrument's 95 degree field-of-view, providing an unprecedented view flux rope morphology CME's internal structure. The same CME was seen by STEREO, beginning 25 January. Aims: Our goal to understand origin and determine trajectory this CME. Methods: We analyzed data three well-placed spacecraft: (PSP), Terrestrial Relations Observatory-Ahead (STEREO-A), Dynamics Observatory (SDO). determined using method described in Liewer et al. (2020) verified simultaneous images propagation STEREO-A. fortuitous alignment with STEREO-A also provided views activity leading up eruption. Observations SDO, conjunction potential magnetic field models corona, were used analyze evolution for days corona Results: found that is likely end result slow eruption began 23 STEREO-A/Extreme Ultraviolet Imager (EUVI). Analysis these observations suggest apparently constrained more than day before its final STEREO-A/COR2 swelling brightening overlying streamer several hours prior led us classify streamer-blowout analysis SDO suggests restructuring fields caused emerging active region rope.