The soft X-ray characteristics of solar flares, both with and without associated CMEs

Kay, H.R.M.; Harra, L. K.; Matthews, Sarah; Culhane, J. L.; Green, L. M.

doi:10.1051/0004-6361:20030095

Cited by 31 publications

(35 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…figure 3) in accordance with previous results in [5] and [7] although the latter derive these results comparing duration to peak intensity. As regards Flare rise time versus decay time no systematic difference appears for the two subgroups in accordance with similar results in [7].…”

supporting

confidence: 93%

Type II Shocks Characteristics: Comparison with associated CMEs and Flares

Pothitakis¹

2006

AIP Conference Proceedings

View full text Add to dashboard Cite

show abstract

supporting

confidence: 93%

Type II Shocks Characteristics: Comparison with associated CMEs and Flares

Pothitakis¹

2006

AIP Conference Proceedings

View full text Add to dashboard Cite

show abstract

“…This model supports the proposal by Delannée & Aulanier (1999) that EIT waves are related to the magnetic restructuring in CMEs. The results of Kay et al (2003) also favor the idea that a CME is a necessary condition for the appearance of EIT waves during flares, although most of the non-CME flares in their sample have peak intensities below the M class.…”

Section: Discussionmentioning

confidence: 53%

“…Regarding the second question, Biesecker et al (2002) found an unambiguous correlation between EIT waves and CMEs, and a significantly weaker correlation of EIT waves with flares. Kay et al (2003) also found that all "EIT wave"-associated flares are accompanied by CMEs. Recently, Cliver et al (2005) pointed out that about half of the EIT waves observed from 1997 March to 1998 June were associated with small solar flares below the C class, which implies that it is unlikely that it is the pressure pulse in the flare that causes a fast-mode wave to be observed as EIT waves.…”

Section: Introductionmentioning

confidence: 83%

The Relation between EIT Waves and Solar Flares

Chen

2006

ApJ

View full text Add to dashboard Cite

In order to determine whether EIT waves are generated by coronal mass ejections (CMEs) or pressure pulses in solar flares, 14 non-CME-associated energetic flares, which should possess strong pressure pulses in their loops, are studied. They are selected near solar minimum, as this favors the detection of EIT waves. It is found that none of these flares are associated with EIT waves. Particular attention is paid to AR 0720, which hosted both CME-associated and non-CME types of flares. The SOHO/EIT images convincingly indicate that EIT waves and expanding dimmings appear only when CMEs are present. Therefore, it is unlikely that pressure pulses from flares generate EIT waves.

show abstract

“…Therefore, "EIT waves" are EIT waves 57 a phenomenon intrinsically connected with CMEs. The speeds of these "EIT waves"-associated CMEs range from ∼200-1800 km s −1 , and there is no correlation between the occurrence of an "EIT wave" and the linearly fitted speed of the CME (Kay et al 2003).…”

Section: Introductionmentioning

confidence: 95%

EIT waves – A signature of global magnetic restructuring in CMEs

Chen

Fang

2004

Proc. IAU

View full text Add to dashboard Cite

Abstract. The discovery of "EIT waves" after the launch of SOHO spacecraft sparked wide interest among the coronal mass ejection (CME) community since they may be crucial to the understanding of CMEs. However, the nature of this phenomenon is still being hotly debated between fast-mode wave explanation and non-wave explanation. Accumulating observations have shown various features of the "EIT waves". For example, they tend to be devoid of magnetic neutral lines and coronal holes; they may stop near the magnetic separatrix between the source region and a nearby active region; they may experience an acceleration from the vicinity of the source active region to the quiet region, and so on. This paper is aimed to review all these features, discuss how these observations may provide constraints for the theoretical models, and point out their implication to the understanding of CMEs.Keywords. Sun: CMEs, waves, Sun: UV radiation, Sun: activity, magnetic fields After the launch in 1995 December, Solar and Heliospheric Observatory (SOHO) spacecraft (Domingo, Fleck, & Poland 1995) provided unprecedented views of the structures and activities of the Sun, which greatly enhanced our understanding of the solar interior, solar atmosphere, solar wind, coronal mass ejections (CMEs), and so on. One of the most striking discoveries is the ubiquity of waves propagating in the low corona, conventionally referred to as "EIT waves", concurrent with the launch of front-disk CMEs as revealed by the Fe XII 195Å running difference images of EUV Imaging Telescope (EIT; Delaboudinière et al. 1995) on SOHO. They not only manifest the low coronal signature of these more or less earth-directed CMEs, thus are very important for the space weather forecast, but also sparked hot debate of the relation between them and the Moreton waves discovered more than 40 years ago. This paper is aimed to piece the main properties of "EIT waves" together to see how they can be understood, and how the understanding can shed light on the nature of CMEs. § 1 gives a general description of the "EIT waves", § 2 reviews their properties which led to a fast-mode wave explanation, § 3 is devoted to their properties which led to a non-wave explanation, and § 4 summarizes how the diversity of their features can fit into a self-consistent picture, followed by a discussion of the implication of the understanding of "EIT waves" to the nature of CMEs in § 5.

show abstract

The soft X-ray characteristics of solar flares, both with and without associated CMEs

Cited by 31 publications

References 27 publications

Type II Shocks Characteristics: Comparison with associated CMEs and Flares

Type II Shocks Characteristics: Comparison with associated CMEs and Flares

The Relation between EIT Waves and Solar Flares

EIT waves – A signature of global magnetic restructuring in CMEs

Contact Info

Product

Resources

About