Coronal “wave”: A signature of the mechanism making CMEs largescale in the low corona?

Attrill, G. D. R.; Harra, L. K.; Driel-Gesztelyi, L. van; Démoulin, P.; Wülser, J. P.

doi:10.1002/asna.200710794

Cited by 44 publications

(50 citation statements)

References 27 publications

(34 reference statements)

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“…The observation of the CH crossing (or transmission) is a very strong argument for the wave nature of these EUV disturbances. Until now, it has been reported based on empirical evidence that coronal waves do not traverse CHs (e.g., Thompson et al 1999;Veronig et al 2006;Attrill et al 2007b;Ma et al 2009). However, transmission has been discussed in the simulations of Schmidt & Ofman (2010), who also discuss it in terms of waves launched by the "resonating" of the CH.…”

Section: Conclusion and Discussionmentioning

confidence: 99%

“…The pseudo-wave interpretation proposes several mechanisms all associated with the large-scale structure of the associated CME. One such pseudo-wave is the propagating reconnection front (Attrill et al 2007a(Attrill et al , 2007bvan Driel-Gesztelyi et al 2008), in which, as the CME is expanding, it interacts with the smaller scale loops in the vicinity via reconnection to produce heat and enhanced EUV intensity. Another possible pseudo-wave mechanism is the disk projection of large-scale current shells that surround the expanding flux-rope core of a CME (Delannée et al 2008).…”

Section: Introductionmentioning

confidence: 99%

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SECONDARY WAVES AND/OR THE “REFLECTION” FROM AND “TRANSMISSION” THROUGH A CORONAL HOLE OF AN EXTREME ULTRAVIOLET WAVE ASSOCIATED WITH THE 2011 FEBRUARY 15 X2.2 FLARE OBSERVED WITHSDO/AIA ANDSTEREO/EUVI

Olmedo

Vourlidas

Zhang

et al. 2012

ApJ

112

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For the first time, the kinematic evolution of a coronal wave over the entire solar surface is studied. Full Sun maps can be made by combining images from the Solar Terrestrial Relations Observatory satellites, Ahead and Behind, and the Solar Dynamics Observatory, thanks to the wide angular separation between them. We study the propagation of a coronal wave, also known as the "Extreme Ultraviolet Imaging Telescope" wave, and its interaction with a coronal hole (CH) resulting in secondary waves and/or reflection and transmission. We explore the possibility of the wave obeying the law of reflection. In a detailed example, we find that a loop arcade at the CH boundary cascades and oscillates as a result of the extreme ultraviolet (EUV) wave passage and triggers a wave directed eastward that appears to have reflected. We find that the speed of this wave decelerates to an asymptotic value, which is less than half of the primary EUV wave speed. Thanks to the full Sun coverage we are able to determine that part of the primary wave is transmitted through the CH. This is the first observation of its kind. The kinematic measurements of the reflected and transmitted wave tracks are consistent with a fast-mode magnetohydrodynamic wave interpretation. Eventually, all wave tracks decelerate and disappear at a distance. A possible scenario of the whole process is that the wave is initially driven by the expanding coronal mass ejection and subsequently decouples from the driver and then propagates at the local fast-mode speed.

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Section: Conclusion and Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

SECONDARY WAVES AND/OR THE “REFLECTION” FROM AND “TRANSMISSION” THROUGH A CORONAL HOLE OF AN EXTREME ULTRAVIOLET WAVE ASSOCIATED WITH THE 2011 FEBRUARY 15 X2.2 FLARE OBSERVED WITHSDO/AIA ANDSTEREO/EUVI

Olmedo

Vourlidas

Zhang

et al. 2012

ApJ

112

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“…Observations of EUV waves revealed a series of features which strongly appeal to pseudo-wave interpretations (Attrill et al, 2007a(Attrill et al, ,b, 2009Cohen et al, 2009;Zhukov, Rodriguez, and de Patoul, 2009;Dai et al, 2010;Schrijver et al, 2011;Warmuth and Mann, 2011). These include stationary brightenings, large-scale secondary dimmings and erratic (including a series of accelerations and decelerations) or "slow" (i.e.…”

Section: Brightenings Secondary Dimmings and Volume Expansionsmentioning

confidence: 97%

“…The latter is the key weakness of this interpretation, as (2000)). Pseudo-wave -current shell (panel (b), from Delannée et al (2008)), pseudo-wave -reconnection front, (panel (c), from Attrill et al (2007a)) ; hybrid pseudo-wave + MHD wave/shock,(panel (d), from Chen et al (2002)). Panels (a), (c) and (d) reproduced by permission of the AAS.…”

Section: Introductionmentioning

confidence: 99%

On the Nature and Genesis of EUV Waves: A Synthesis of Observations from SOHO, STEREO, SDO, and Hinode (Invited Review)

2012

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A major, albeit serendipitous, discovery of the SOlar and Heliospheric Observatory mission was the observation by the Extreme Ultraviolet Telescope (EIT) of large-scale Extreme Ultraviolet (EUV) intensity fronts propagating over a significant fraction of the Sun's surface. These so-called EIT or EUV waves are associated with eruptive phenomena and have been studied intensely. However, their wave nature has been challenged by non-wave (or pseudo-wave) interpretations and the subject remains under debate. A string of recent solar missions has provided a wealth of detailed EUV observations of these waves bringing us closer to resolving their nature. With this review, we gather the current state-of-art knowledge in the field and synthesize it into a picture of an EUV wave driven by the lateral expansion of the CME. This picture can account for both wave and pseudo-wave interpretations of the observations, thus resolving the controversy over the nature of EUV waves to a large degree but not completely. We close with a discussion of several remaining open questions in the field of EUV waves research.

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“…By analysing TRACE data Ballai et al (2005) showed that EIT waves observed by the EUV instrument exhibit oscillatory behaviour with a period of approximately 400 seconds. In contrast, Attrill et al (2007) illustrated a model where EIT waves are, in fact, a succession of reconnection events.…”

Section: Introductionmentioning

confidence: 99%

MHD waves at a spherical interface modelling coronal global EIT waves

Douglas

Ballai

2007

Proc. IAU

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Abstract.Energetically eruptive events such as flares and coronal mass ejections (CMEs) are known to generate global waves, propagating over large distances, sometimes comparable to the solar radius. In this contribution EIT waves are modelled as waves propagating at a spherical density interface in the presence of a radially expanding magnetic field. The generation and propagation of EIT waves is studied numerically for coronal parameters. Simple equilibria allow the explanation of the coronal dimming caused by EIT waves as a region of rarified plasma created by a siphon flow.

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Coronal “wave”: A signature of the mechanism making CMEs largescale in the low corona?

Cited by 44 publications

References 27 publications

SECONDARY WAVES AND/OR THE “REFLECTION” FROM AND “TRANSMISSION” THROUGH A CORONAL HOLE OF AN EXTREME ULTRAVIOLET WAVE ASSOCIATED WITH THE 2011 FEBRUARY 15 X2.2 FLARE OBSERVED WITHSDO/AIA ANDSTEREO/EUVI

SECONDARY WAVES AND/OR THE “REFLECTION” FROM AND “TRANSMISSION” THROUGH A CORONAL HOLE OF AN EXTREME ULTRAVIOLET WAVE ASSOCIATED WITH THE 2011 FEBRUARY 15 X2.2 FLARE OBSERVED WITHSDO/AIA ANDSTEREO/EUVI

On the Nature and Genesis of EUV Waves: A Synthesis of Observations from SOHO, STEREO, SDO, and Hinode (Invited Review)

MHD waves at a spherical interface modelling coronal global EIT waves

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