A Coronal Mass Ejection and Magnetic Ejecta Observed In Situ by STEREO-A and Wind at 55° Angular Separation

We present an analysis of {\it in situ} and remote-sensing measurements a coronal mass ejection (CME) that erupted on 2021 February 20 impacted both the Solar TErrestrial RElations Observatory (STEREO)-A Wind} spacecraft, which were separated longitudinally by 55$^\circ$. Measurements 24 at spacecraft are consistent with passage magnetic ejecta (ME), making this one widest reported multi-spacecraft ME detections. The CME is associated low-inclined wide filament eruption from Sun's southern hemisphere, propagates between STEREO-A around E34. At STEREO-A, indicate moderately fast ($\sim 425$~km\,s$^{-1}$) shock-driving ME, occurring 2--3 days after end high speed stream (HSS). Wind}, show faster 490$~km\,s$^{-1}$) much shorter not preceded shock nor sheath, inside back portion HSS. orientation measured close to legs curved flux rope. short duration observed difference suprathermal electron pitch-angle data two only results do satisfy common expectations. discuss consequence these our understanding shape extent lack clear signatures interaction