Quantitative Analysis of CME Deflections in the Corona

Gui, B.; Shen, Chenglong; Wang, Yuming; Ye, Pinzhong; Li, Jiajia; Wang, Shui; Zhao, Xue

doi:10.1007/s11207-011-9791-9

Cited by 122 publications

(135 citation statements)

References 44 publications

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“…Flux ropes ejected from the solar corona during CMEs may travel through interplanetary space largely intact, and careful examination suggests that they can be connected to the magnetic structures observed at 1 AU (e.g., Yurchyshyn et al 2007;Démoulin 2008;Möstl et al 2008;Liu et al 2010aLiu et al ,b, 2011Howard and DeForest 2012;Manchester et al 2014a;. The magnetic fields associated with ICMEs often retain a coherent structure resembling a flux rope.…”

Section: Icmes and Magnetic Cloudsmentioning

confidence: 99%

“…In this case, what is seen by a spacecraft is the segment tangent to the line of sight. The triangulation concept has proven to be a useful tool for determining CME Sun-to-Earth kinematics and connecting imaging observations with in situ signatures (e.g., Liu et al 2010aLiu et al ,b, 2011Mishra and Srivastava 2013). Details of when, where, and how CMEs accelerate/decelerate in interplanetary space can be quantified using the kinematics derived with the triangulation method.…”

Section: A Brief Overview Of Cme Kinematicsmentioning

confidence: 99%

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The Physical Processes of CME/ICME Evolution

et al. 2017

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As observed in Thomson-scattered white light, coronal mass ejections (CMEs) are manifest as large-scale expulsions of plasma magnetically driven from the corona in the most energetic eruptions from the Sun. It remains a tantalizing mystery as to how these erupting magnetic fields evolve to form the complex structures we observe in the solar wind at Earth. Here, we strive to provide a fresh perspective on the post-eruption and interplanetary evolution of CMEs, focusing on the physical processes that define the many complex interactions of the ejected plasma with its surroundings as it departs the corona and propagates through the heliosphere. We summarize the ways CMEs and their interplanetary CMEs (ICMEs) are rotated, reconfigured, deformed, deflected, decelerated and disguised during their journey through the solar wind. This study then leads to consideration of how structures originating in coronal eruptions can be connected to their far removed interplanetary counterparts. Given that ICMEs are the drivers of most geomagnetic storms (and the sole driver of extreme storms), this work provides a guide to the processes that must be considered in making space weather forecasts from remote observations of the corona.

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Section: Icmes and Magnetic Cloudsmentioning

confidence: 99%

Section: A Brief Overview Of Cme Kinematicsmentioning

confidence: 99%

The Physical Processes of CME/ICME Evolution

et al. 2017

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“…Defining the background is one of the key inputs needed for understanding CME propagation (see e.g., Roussev et al 2012;Arge et al 2013). However, there are other processes that can significantly affect the propagation of CMEs: CME-CME interaction (see e.g., Gopalswamy et al 2001a;2012c;Temmer et al 2012;Harrison et al 2012;Lugaz et al 2012;Liu et al 2014a;Sterling et al 2014;Temmer et al 2014) and CME deflection by largescale structures such as coronal holes and streamers (Gopalswamy 2010(Gopalswamy , 2009dShen et al 2011;Gui et al 2011;Wood et al 2012;Kay et al 2013;Panasenco et al 2013;Gopalswamy and Mäkelä 2014).…”

Section: Propagation Effects: Deflection Interaction and Rotation Omentioning

confidence: 99%

“…In the declining phase, low-latitude coronal holes appear frequently, so CME deflection by such coronal holes becomes important (Gopalswamy et al 2009d;Mohamed et al 2012;Mäkelä et al 2013). The deflections are thought to be caused by the magnetic pressure gradient between the eruption region and the coronal hole (Gopalswamy et al 2010d;Shen et al 2011;Gui et al 2011).…”

Section: Propagation Effects: Deflection Interaction and Rotation Omentioning

confidence: 99%

Short-term variability of the Sun-Earth system: an overview of progress made during the CAWSES-II period

Gopalswamy

Tsurutani

Yan

2015

Prog. in Earth and Planet. Sci.

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This paper presents an overview of results obtained during the CAWSES-II period on the short-term variability of the Sun and how it affects the near-Earth space environment. CAWSES-II was planned to examine the behavior of the solar-terrestrial system as the solar activity climbed to its maximum phase in solar cycle 24. After a deep minimum following cycle 23, the Sun climbed to a very weak maximum in terms of the sunspot number in cycle 24 (MiniMax24), so many of the results presented here refer to this weak activity in comparison with cycle 23. The short-term variability that has immediate consequence to Earth and geospace manifests as solar eruptions from closed-field regions and high-speed streams from coronal holes. Both electromagnetic (flares) and mass emissions (coronal mass ejections -CMEs) are involved in solar eruptions, while coronal holes result in high-speed streams that collide with slow wind forming the so-called corotating interaction regions (CIRs). Fast CMEs affect Earth via leading shocks accelerating energetic particles and creating large geomagnetic storms. CIRs and their trailing high-speed streams (HSSs), on the other hand, are responsible for recurrent small geomagnetic storms and extended days of auroral zone activity, respectively. The latter leads to the acceleration of relativistic magnetospheric 'killer' electrons. One of the major consequences of the weak solar activity is the altered physical state of the heliosphere that has serious implications for the shock-driving and storm-causing properties of CMEs. Finally, a discussion is presented on extreme space weather events prompted by the 23 July 2012 super storm event that occurred on the backside of the Sun. Many of these studies were enabled by the simultaneous availability of remote sensing and in situ observations from multiple vantage points with respect to the Sun-Earth line.

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“…Basic characteristics of the candidate source regions, like heliographic coordinates and neutral line tilt, were contrasted to the CMEs direction of propagation, main symmetry axis orientation, and general three-dimensional morphology. In all of the analyzed cases, significant deflections were found, not only in the latitudinal direction, but also in the usually unexplored longitudinal one (see Gui et al 2011;and references herein). The performed morphological analysis revealed that the CMEs main axis orientations are in general accordance with their associated source region tilts.…”

Section: The Cme Occurred On May 29 2011mentioning

confidence: 81%

Solar activity and its evolution across the corona: recent advances

Zuccarello¹,

Balmaceda

Cessateur

et al. 2013

J. Space Weather Space Clim.

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Solar magnetism is responsible for the several active phenomena that occur in the solar atmosphere. The consequences of these phenomena on the solar-terrestrial environment and on Space Weather are nowadays clearly recognized, even if not yet fully understood. In order to shed light on the mechanisms that are at the basis of the Space Weather, it is necessary to investigate the sequence of phenomena starting in the solar atmosphere and developing across the outer layers of the Sun and along the path from the Sun to the Earth. This goal can be reached by a combined multi-disciplinary, multi-instrument, multi-wavelength study of these phenomena, starting with the very first manifestation of solar active region formation and evolution, followed by explosive phenomena (i.e., flares, erupting prominences, coronal mass ejections), and ending with the interaction of plasma magnetized clouds expelled from the Sun with the interplanetary magnetic field and medium. This wide field of research constitutes one of the main aims of COST Action ES0803: Developing Space Weather products and services in Europe. In particular, one of the tasks of this COST Action was to investigate the Progress in Scientific Understanding of Space Weather. In this paper we review the state of the art of our comprehension of some phenomena that, in the scenario outlined above, might have a role on Space Weather, focusing on the researches, thematic reviews, and main results obtained during the COST Action ES0803.

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Quantitative Analysis of CME Deflections in the Corona

Cited by 122 publications

References 44 publications

The Physical Processes of CME/ICME Evolution

The Physical Processes of CME/ICME Evolution

Short-term variability of the Sun-Earth system: an overview of progress made during the CAWSES-II period

Solar activity and its evolution across the corona: recent advances

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