Large-Scale Extreme-Ultraviolet Disturbances Associated With a Limb Coronal Mass Ejection

Dai, Y.; Auchère, F.; Vial, J. C.; Tang, Yuhua; Zong, Weiguo

doi:10.1088/0004-637x/708/2/913

Cited by 58 publications

(58 citation statements)

References 44 publications

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“…This anticorrelation between 171Å and 193/195Å has been noted by many authors (e.g., Wills-Davey and Dai et al, 2010;Liu et al, 2010;Long et al, 2011a;Schrijver et al, 2011) and implies that plasma heating is taking place between 0.8 and 1.6 MK. Still, 171Å waves can appear as an emission increase if the ambient corona is quite cool (this may be the reason for the high percentage of bright 171Å waves found during the recent solar minimum by Nitta et al, 2014), if there is no significant heating, or if the compression is so strong as to overcome the heating-related intensity reduction.…”

Section: Thermal Characteristicssupporting

confidence: 75%

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Large-scale Globally Propagating Coronal Waves

Warmuth

2015

Living Rev. Sol. Phys.

168

140

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Large-scale, globally propagating wave-like disturbances have been observed in the solar chromosphere and by inference in the corona since the 1960s. However, detailed analysis of these phenomena has only been conducted since the late 1990s. This was prompted by the availability of high-cadence coronal imaging data from numerous spaced-based instruments, which routinely show spectacular globally propagating bright fronts. Coronal waves, as these perturbations are usually referred to, have now been observed in a wide range of spectral channels, yielding a wealth of information. Many findings have supported the "classical" interpretation of the disturbances: fast-mode MHD waves or shocks that are propagating in the solar corona. However, observations that seemed inconsistent with this picture have stimulated the development of alternative models in which "pseudo waves" are generated by magnetic reconfiguration in the framework of an expanding coronal mass ejection. This has resulted in a vigorous debate on the physical nature of these disturbances. This review focuses on demonstrating how the numerous observational findings of the last one and a half decades can be used to constrain our models of large-scale coronal waves, and how a coherent physical understanding of these disturbances is finally emerging. Article RevisionsLiving Reviews supports two ways of keeping its articles up-to-date:Fast-track revision. A fast-track revision provides the author with the opportunity to add short notices of current research results, trends and developments, or important publications to the article. A fast-track revision is refereed by the responsible subject editor. If an article has undergone a fast-track revision, a summary of changes will be listed here.Major update. A major update will include substantial changes and additions and is subject to full external refereeing. It is published with a new publication number.For detailed documentation of an article's evolution, please refer to the history document of the article's online version at http://dx

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Section: Thermal Characteristicssupporting

confidence: 75%

“…Using high-cadence EUV imaging, several authors have reported events where the coronal waves were cospatial to or remained closely attached to the expanding CME flanks (Chen, 2009;Attrill et al, 2009;Dai et al, 2010).…”

Section: Coronal Mass Ejections (Cmes)mentioning

confidence: 99%

Large-scale Globally Propagating Coronal Waves

Warmuth

2015

Living Rev. Sol. Phys.

168

140

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“…But how can these results be reconciled with past reports of the exact opposite behavior Warmuth, 2010) or with the claims of a single front Dai et al, 2010)? In a nutshell and with the benefit of hindsight, these conflicting reports were cases of front misidentification due to poor wavelength and temporal coverage.…”

Section: D Structure and Relationship With Cmesmentioning

confidence: 80%

“…For the cases where only one front is reported, the low cadence does seem to affect the interpretation. Dai et al (2010) actually observe and comment on the existence of two fronts (their Figure 4) but they disregard the wave interpretation on the basis of the low lateral speed (260 km s −1 ) compared to the speed of the CME (600 km s −1 ). But these are exactly the speeds expected by an MHD wave far from the eruption and they lack the cadence to measure the much higher speeds at earlier times.…”

Section: D Structure and Relationship With Cmesmentioning

confidence: 99%

“…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: 99%

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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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Global Coronal Waves

Chen¹

2016

Geophysical Monograph Series

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Large-Scale Extreme-Ultraviolet Disturbances Associated With a Limb Coronal Mass Ejection

Cited by 58 publications

References 44 publications

Large-scale Globally Propagating Coronal Waves

Large-scale Globally Propagating Coronal Waves

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

Global Coronal Waves

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