Observational Evidence for a Double-Helix Structure in CMEs and Magnetic Clouds

Osherovich, V. A.; Fainberg, J.; Webb, Alla

doi:10.1007/s11207-013-0278-8

Cited by 6 publications

(1 citation statement)

References 29 publications

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“…F-and F r populations can arise from large and small impact parameter crossings, respectively (Nieves-Chinchilla et al 2019). F+ configurations may correspond to MEs with significant curvatures or complex topologies such as spheromaks (Vandas et al 1997;Nieves-Chinchilla et al 2019;Scolini et al 2021) or double FRs (Lugaz et al 2013;Osherovich et al 2013;Nieves-Chinchilla et al 2019). C x class can be associated with eruptions from complex active regions at the Sun (Nieves- Chinchilla et al 2019) or interactions between multiple ICMEs (Lugaz et al 2017).…”

Section: Me Complexitymentioning

confidence: 99%

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

Salman,

Nieves-Chinchilla,

Jian

et al. 2024

ApJ

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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.

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