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

Sanchita Pal; Benjamin J. Lynch; Simon W. Good; Erika Palmerio; Eleanna Asvestari; Jens Pomoell; Michael L. Stevens; Emilia K. J. Kilpua

arXiv · 2205.07713

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

Sanchita Pal·Benjamin J. Lynch·Simon W. Good·Erika Palmerio·Eleanna Asvestari·Jens Pomoell·Michael L. Stevens·Emilia K. J. Kilpua

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Abstract

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

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Sanchita Pal, Benjamin J. Lynch, Simon W. Good, Erika Palmerio, Eleanna Asvestari, Jens Pomoell, Michael L. Stevens, Emilia K. J. Kilpua. 2022-05-16. Eruption and Interplanetary Evolution of a Stealthy Streamer-Blowout CME Observed by PSP at ${\sim}$0.5~AU. https://arxiv.org/abs/2205.07713

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