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The shape and dynamics of coronal mass ejections (CMEs) vary significantly based on the instrument and wavelength used. This has led to significant debate about the proper definitions of CME/shock fronts, pile-up/compression regions, and…

太阳与恒星天体物理 · 物理学 2025-08-27 Oleg Stepanyuk , Kamen Kozarev

Context. Coronal mass ejections (CMEs) are the main driver of solar wind disturbances near Earth. When directed towards us, the internal magnetic field of the CME can interact with the Earth`s magnetic field and cause geomagnetic storms. In…

太阳与恒星天体物理 · 物理学 2024-02-07 Tinatin Baratashvili , Stefaan Poedts

Coronal mass ejections (CMEs) are large-scale ejections of plasma and magnetic field from the solar corona, which propagate through interplanetary space at velocities of $\sim$100--2500~km~s$^{-1}$. Although plane-of-sky coronagraph…

太阳与恒星天体物理 · 物理学 2011-06-09 Shane A. Maloney , Peter T. Gallagher

The relative importance of different initiation mechanisms for coronal mass ejections (CMEs) on the Sun is uncertain. One possible mechanism is the loss of equilibrium of coronal magnetic flux ropes formed gradually by large-scale surface…

太阳与恒星天体物理 · 物理学 2014-11-20 A. R. Yeates , G. D. R. Attrill , Dibyendu Nandy , D. H. Mackay , P. C. H. Martens , A. A. van Ballegooijen

Propagation of coronal mass ejections (CMEs) from the Sun far into interplanetary space is not well understood due to limited observations. In this study we examine the propagation characteristics of two geo-effective CMEs, which occurred…

太阳与恒星天体物理 · 物理学 2017-03-08 Xiaowei Zhao , Ying D. Liu , Huidong Hu , Rui Wang

Solar coronal mass ejections (CMEs) can catch up and interact with preceding CMEs and solar wind structures to undergo rotation and deflection during their propagation. We aim to show how interactions undergone by a CME in the corona and…

太阳与恒星天体物理 · 物理学 2023-07-12 Anwesha Maharana , Camilla Scolini , Brigitte Schmieder , Stefaan Poedts

The evolution of the magnetic field and plasma quantities inside a coronal mass ejection (CME) with distance are known from statistical studies using data from 1 au monitors, planetary missions, Helios, and Ulysses. This does not cover the…

太阳与恒星天体物理 · 物理学 2019-11-06 Nada Al-Haddad , Noe Lugaz , Stefaan Poedts , Charles J. Farrugia and , Teresa Nieves-Chinchilla

The Solar TErrestrial RElations Observatory (STEREO) provides high cadence and high resolution images of the structure and morphology of coronal mass ejections (CMEs) in the inner heliosphere. CME directions and propagation speeds have…

太阳与恒星天体物理 · 物理学 2015-03-31 Savani , N. P. , Davies , J. A. , Davis , C. J. , Shiota , D. , Rouillard , A. P. , Owens , M. J. , Kusano , K. , Bothmer , V. , Bamford , S. P. , Lintott , C. J. , Smith , A

Coronal and interplanetary shock waves produced by coronal mass ejections (CMEs) are major drivers of space-weather phenomena, inducing major changes in the heliospheric radiation environment and directly perturbing the near-Earth…

太阳与恒星天体物理 · 物理学 2023-04-12 Manon Jarry , Alexis P. Rouillard , Illya Plotnikov , Athanasios Kouloumvakos , Alexander Warmuth

The diffuse morphology and transient nature of coronal mass ejections (CMEs) make them difficult to identify and track using traditional image processing techniques. We apply multiscale methods to enhance the visibility of the faint CME…

太阳与恒星天体物理 · 物理学 2009-02-20 Jason P. Byrne , Peter T. Gallagher , R. T. James McAteer , C. Alex Young

Understanding and predicting the structure and evolution of coronal mass ejections (CMEs) in the heliosphere remains one of the most sought-after goals in heliophysics and space weather research. A powerful tool for improving current…

Stealth coronal mass ejections (CMEs) are eruptions from the Sun that have no obvious low coronal signature. These CMEs are characteristically slower events, but can still be geoeffective and affect space weather at Earth. Therefore,…

太阳与恒星天体物理 · 物理学 2019-09-11 Jennifer O'kane , Lucie Green , David M. Long , Hamish Reid

We present hydrodynamical simulations of interacting Coronal Mass Ejections in the Interplanetary medium (ICMEs). In these events, two consecutive CMEs are launched from the Sun in similar directions within an interval of time of a few…

太阳与恒星天体物理 · 物理学 2018-01-11 Tatiana Niembro , Alejandro Lara , Ricardo F. González , J. Cantó

Coronal mass ejections (CMEs) are the largest type of eruptions on the Sun and the main driver of severe space weather at the Earth. In this study, we implement a force-free spheromak CME description within 3-D magnetohydrodynamic…

太阳与恒星天体物理 · 物理学 2022-12-20 Gordon J. Koehn , Ravindra T. Desai , Emma E. Davies , Robert J. Forsyth , Jonathan P. Eastwood , Stefaan Poedts

Coronal Mass Ejections (CMEs) are subject to changes in their direction of propagation, tilt, and other properties as they interact with the variable solar wind. We investigated the heliospheric propagation of 15 Earth-impacting CMEs…

太阳与恒星天体物理 · 物理学 2024-11-05 Sandeep Kumar , Nandita Srivastava , Nat Gopalswamy , Ashutosh Dash

Coronal mass ejections (CMEs) are large eruptions from the Sun that propagate through the heliosphere after launch. Observational studies of these transient phenomena are usually based on 2D images of the Sun, corona, and heliosphere…

The trajectories of coronal mass ejections (CMEs) are often seen to substantially deviate from a purely radial propagation direction. Such deviations occur predominantly in the corona and have been attributed to "channeling" or deflection…

We investigate the coronal and interplanetary evolution of a coronal mass ejection (CME) launched on 2010 September 4 from a source region linking two active regions (ARs) 11101 and 11103, using extreme ultraviolet imaging, magnetogram,…

太阳与恒星天体物理 · 物理学 2017-05-24 Huidong Hu , Ying D. Liu , Rui Wang , Xiaowei Zhao , Bei Zhu , Zhongwei Yang

Investigating the heliospheric evolution and consequences of Coronal mass ejections (CMEs) is critical to understanding the solar-terrestrial relationship. For the first time, Heliospheric Imagers (HIs) onboard STEREO, providing multiple…

太阳与恒星天体物理 · 物理学 2022-04-22 Wageesh Mishra

We report on a numerical investigation of two coronal mass ejections (CMEs) which interact as they propagate in the inner heliosphere. We focus on the effect of the orientation of the CMEs relative to each other by performing four different…

空间物理 · 物理学 2015-06-17 N. Lugaz , C. J. Farrugia , W. B. Manchester , N. Schwadron