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Streamer-blowout coronal mass ejections (SBO-CMEs) are the dominant CMEpopulation during solar minimum. Although they are typically slow and lackclear low-coronal signatures, they can cause geomagnetic storms. With the aidof extrapolated coronal fields and remote observations of the off-limb lowcorona, we study the initiation of an SBO-CME preceded by consecutive CMEeruptions consistent with a multi-stage sympathetic breakout scenario. Frominner-heliospheric Parker Solar Probe (PSP) observations, it is evident thatthe SBO-CME is interacting with the heliospheric magnetic field and plasmasheet structures draped about the CME flux rope. We estimate that $18 \, \pm \,11\%$ of the CME's azimuthal magnetic flux has been eroded through magneticreconnection and that this erosion began after a heliospheric distance of${\sim}0.35$ AU from the Sun was reached. This observational study hasimportant implications for understanding the initiation of SBO-CMEs and theirinteraction with the heliospheric surroundings.

Eruption and Interplanetary Evolution of a Stealthy Streamer-Blowout CME Observed by PSP at ${\sim}$0.5~AU