A Survey of Coronal Mass Ejections Measured In Situ by Parker Solar Probe during 2018–2022

We present a statistical investigation of the radial evolution of 28 interplanetary coronal mass ejections (ICMEs), measured in situ by the Parker Solar Probe spacecraft from 2018 October to 2022 August. First, by analyzing the radial distribution of ICME classification based on magnetic hodograms,...

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Bibliographic Details
Published in:The Astrophysical journal 2024-05, Vol.966 (1), p.118
Main Authors: Salman, Tarik Mohammad, Nieves-Chinchilla, Teresa, Jian, Lan K., Lugaz, Noé, Carcaboso, Fernando, Davies, Emma E., Collado-Vega, Yaireska M.
Format: Article
Language:English
Subjects:
Asymmetry
Configurations
Coronal mass ejection
Ejecta
Field strength
Fluctuations
Heliosphere
Interplanetary magnetic fields
Magnetic fields
Radial distribution
Robustness (mathematics)
Sheaths
Solar coronal mass ejections
Solar magnetic field
Solar probes
Solar wind
Spacecraft
Statistical analysis
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Summary:We present a statistical investigation of the radial evolution of 28 interplanetary coronal mass ejections (ICMEs), measured in situ by the Parker Solar Probe spacecraft from 2018 October to 2022 August. First, by analyzing the radial distribution of ICME classification based on magnetic hodograms, we find that coherent configurations are more likely to be observed close to the Sun. By contrast, more complex configurations are observed farther out. We also notice that the post-ICME magnetic field is more impacted following an ICME passage at larger heliocentric distances. Second, with a multilinear robust regression, we derive a slower magnetic ejecta (ME) expansion rate within 1 au compared to previous statistical estimates. Then, investigating the magnetic field fluctuations within ICME sheaths, we see that these fluctuations are strongly coupled to the relative magnetic field strength gradient from the upstream solar wind to the ME. Third, we identify ME expansion as an important factor in the formation of sheaths. Finally, we determine the distortion parameter (DiP), which is a measure of magnetic field asymmetry in an ME. We discover lower overall asymmetries within MEs. We reveal that even for expanding MEs, the time duration over which an ME is sampled does not correlate with DiP values, indicating that the aging effect is not the sole contributor to the observed ME asymmetries.
ISSN:0004-637X
1538-4357
DOI:10.3847/1538-4357/ad320c