Quantifying the Propagation of Fast Coronal Mass Ejections from the Sun to Interplanetary Space by Combining Remote Sensing and Multi-point In Situ Observations

Zhao, Xiaowei; Liu, Ying D.; Hu, Huidong; Wang, Rui

doi:10.3847/1538-4357/ab379b

Cited by 12 publications

(7 citation statements)

References 64 publications

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“…The above result was confirmed by studies with the imager data of the SoHO and STEREO spacecraft (Liu et al 2016;Wood et al 2017;Zhao et al 2019). Most of the CME deceleration occurs close to the Sun, and the faster events have a stronger deceleration confined closer to the Sun.…”

Section: Constraints On the Global Motionsupporting

confidence: 55%

Contribution of the ageing effect to the observed asymmetry of interplanetary magnetic clouds

Démoulin

Dasso

Lanabere

et al. 2020

A&A

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Context. Large magnetic structures are launched away from the Sun during solar eruptions. They are observed as (interplanetary) coronal mass ejections (ICMEs or CMEs) with coronal and heliospheric imagers. A fraction of them are observed in situ as magnetic clouds (MCs). Fitting these structures properly with a model requires a better understanding of their evolution. Aims. In situ measurements are made locally when the spacecraft trajectory crosses the magnetic configuration. These observations are taken for different elements of plasma and at different times, and are therefore biased by the expansion of the magnetic configuration. This ageing effect means that stronger magnetic fields are measured at the front than at the rear of MCs. This asymmetry is often present in MC data. However, the question is whether the observed asymmetry can be explained quantitatively from the expansion alone. Methods. Based on self-similar expansion, we derived a method for estimating the expansion rate from the observed plasma velocity. We next corrected the observed magnetic field and the spatial coordinate along the spacecraft trajectory for the ageing effect. This provided corrected data as in the case when the MC internal structure were observed at the same time. Results. We apply the method to 90 best-observed MCs near Earth (1995–2012). The ageing effect is the main source of the observed magnetic asymmetry for only 28% of the MCs. After correcting for the ageing effect, the asymmetry is almost symmetrically distributed between MCs with a stronger magnetic field at the front and those at the rear of MCs. Conclusions. The proposed method can efficiently remove the ageing bias within in situ data of MCs, and more generally, of ICMEs. This allows us to analyse the data with a spatial coordinate, such as in models or remote-sensing observations.

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Section: Constraints On the Global Motionsupporting

confidence: 55%

Contribution of the ageing effect to the observed asymmetry of interplanetary magnetic clouds

Démoulin

Dasso

Lanabere

et al. 2020

A&A

View full text Add to dashboard Cite

show abstract

“…The above result was confirmed by studies with the imager data of the SoHO and STEREO spacecraft (Liu et al 2016;Wood et al 2017;Zhao et al 2019). Indeed, most of the CME deceleration occurs close to the Sun, and the faster events have a stronger deceleration confined closer to the Sun.…”

Section: Constraints On the Global Motionsupporting

confidence: 57%

Contribution of the aging effect to the observed asymmetry of interplanetary magnetic clouds

Démoulin,

Dasso,

Lanabere

et al. 2020

Preprint

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Context. Large magnetic structures are launched away from the Sun during solar eruptions. They are observed as (interplanetary) coronal mass ejections (ICMEs or CMEs) with coronal and heliospheric imagers. A fraction of them are observed in situ as magnetic clouds (MCs). Fitting these structures properly with a model requires a better understanding of their evolution. Aims. In situ measurements are done locally when the spacecraft trajectory crosses the magnetic configuration. These observations are taken for different elements of plasma and at different times, and are therefore biased by the expansion of the magnetic configuration. This aging effect leads to stronger magnetic fields measured at the front than at the rear of MCs, an asymmetry often present in MC data. However, can the observed asymmetry be explained quantitatively only from the expansion? Methods. Based on self-similar expansion, we derive a method to estimate the expansion rate from observed plasma velocity. We next correct for the aging effect both the observed magnetic field and the spatial coordinate along the spacecraft trajectory. This provides corrected data as if the MC internal structure was observed at the same time.Results. We apply the method to 90 best observed MCs near Earth (1995Earth ( -2012. The aging effect is the main source of the observed magnetic asymmetry only for 28% of MCs. After correcting the aging effect, the asymmetry is almost symmetrically distributed between MCs with a stronger magnetic field at the front and those at the rear of MCs. Conclusions. The proposed method can efficiently remove the aging bias within in situ data of MCs, and more generally of ICMEs. This allows one to analyse the data with a spatial coordinate, such as in models or remote sensing observations.

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“…The CMEs were found to decelerate in the coronagraph FOV at ∼0-100 m s −2 , where the deceleration is correlated with initial speed (Gopalswamy et al, 2001). Later work confirmed the correlation between initial deceleration and initial speed using the frequency drift rate of the observed type II bursts Zhao et al, 2019).…”

Section: Type II Burst Dependence On Icme Propertiesmentioning

confidence: 83%

A Quarter Century ofWindSpacecraft Discoveries

Wilson

Brosius

Gopalswamy

et al. 2021

Reviews of Geophysics

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Quantifying the Propagation of Fast Coronal Mass Ejections from the Sun to Interplanetary Space by Combining Remote Sensing and Multi-point In Situ Observations

Cited by 12 publications

References 64 publications

Contribution of the ageing effect to the observed asymmetry of interplanetary magnetic clouds

Contribution of the ageing effect to the observed asymmetry of interplanetary magnetic clouds

Contribution of the aging effect to the observed asymmetry of interplanetary magnetic clouds

A Quarter Century ofWindSpacecraft Discoveries

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