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Deng, Yuanyong; Schmieder, B.; Engvold, O.; DeLuca, E. E.; Golub, L.

doi:10.1023/a:1005299227675

Cited by 19 publications

(9 citation statements)

References 7 publications

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“…This mechanism is similar to the one proposed by Spruit et al (1987) for the emergence of U-loops at the photospheric level, but taking place in the lower chromosphere (see also Low & Hundhausen 1995;Rust & Kumar 1994). Deng et al (2000) have recently interpreted the formation of long dark AFS in Hα in a similar way, though no magnetic field topology analysis has been done in this case. The main problem with this mechanism is that it supposes that the magnetic force is strong enough to overcome the gravity force, which is not obvious below the middle chromosphere (see e.g.…”

Section: Afs With One Bpsupporting

confidence: 70%

The role of magnetic bald patches in surges and arch filament systems

Mandrini

Démoulin²,

Schmieder

et al. 2002

A&A

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Abstract. The short-lived active region (AR) NOAA 7968 was thoroughly observed all along its disk transit (June 3 to 10, 1996) from space and from the ground. During the early stage of its evolution, flux emerged in between the two main polarities and arch filament systems (AFS) were observed to be linked to this emergence. New bipoles and a related surge were observed on June 9. We have modeled the magnetic configuration of AR 7968 using a magnetohydrostatic approach and we have analyzed its topology on June 6 and June 9 in detail. We have found that some of the AFS and the surge were associated with field lines having dips tangent to the photosphere (the so called "bald patches", BPs). Two interacting BP separatrices, defining a separator, have been identified in the configuration where these very different events occurred. The observed evolution of the AFS and the surge is consistent with the expected results of magnetic reconnection occuring in this magnetic topology, which is specific to 3D configurations. Previously BPs have been found to be related to filament feet, small flares and transition region brightenings. Our results are evidence of the importance of BPs in a much wider range of phenomena, and show that current layers can be formed and efficiently dissipated in the chromosphere.

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Section: Afs With One Bpsupporting

confidence: 70%

The role of magnetic bald patches in surges and arch filament systems

Mandrini

Démoulin²,

Schmieder

et al. 2002

A&A

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“…However, such concave-upward formations have been observed only rarely in non-erupting prominences (see, e.g., Okamoto et al, 2007). An alternative lifting mechanism is the relaxation of magnetic fields during emergence of U loops (Deng et al, 2000) or after reconnection associated with flux cancellation (van Ballegooijen and Martens, 1989;Priest et al, 1996;Litvinenko and Martin, 1999;Galsgaard and Longbottom, 1999;Litvinenko and Wheatland, 2005;Welsch et al, 2005). Simulations of the reconnectionlevitation mechanism have verified that rising field lines are indeed produced by reconnection between bipolar systems, but significant work remains to prove that this mechanism is responsible for the observed motions and properties of prominence plasma.…”

Section: Levitation Modelsmentioning

confidence: 99%

Physics of Solar Prominences: II—Magnetic Structure and Dynamics

et al. 2010

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Observations and models of solar prominences are reviewed. We focus on non-eruptive prominences, and describe recent progress in four areas of prominence research: (1) magnetic structure deduced from observations and models, (2) the dynamics of prominence plasmas (formation and flows), (3) Magneto-hydrodynamic (MHD) waves in prominences and (4) the formation and large-scale patterns of the filament channels in which prominences are located. Finally, several outstanding issues in prominence research are discussed, along with observations and models required to resolve them.

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“…The expanding loops are filled with cold and dense plasma, elevated from lower layers in the chromosphere. The dense material is no longer in gravitational equilibrium, and hence, it flows along the loops into both footpoints (Malherbe et al 1998;Deng et al 2000). This corresponds to a classic description of an arch filament system (AFS), first introduced by Bruzek (1967) using H observations and interpreted by the ''leaky-bucket'' model of Schmieder, Raadu, & Wiik (1991).…”

Section: Introductionmentioning

confidence: 99%

Emerging Flux and the Heating of Coronal Loops

Schmieder

Rust

Georgoulis

et al. 2004

ApJ

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We use data collected by a multiwavelength campaign of observations to describe how the fragmented, asymmetric emergence of magnetic flux in NOAA active region 8844 triggers the dynamics in the active-region atmosphere. Observations of various instruments on board Yohkoh, SOHO, and TRACE complement highresolution observations of the balloon-borne Flare Genesis Experiment obtained on 2000 January 25. We find that coronal loops appeared and evolved rapidly $6 AE 2 hr after the first detection of emerging magnetic flux. In the low chromosphere, flux emergence resulted in intense Ellerman bomb activity. Besides the chromosphere, we find that Ellerman bombs may also heat the transition region, which showed ''moss'' $100% brighter in areas with Ellerman bombs as compared to areas without Ellerman bombs. In the corona, we find a spatiotemporal anticorrelation between the soft X-ray (SXT) and the extreme ultraviolet (TRACE) loops. First, SXT loops preceded the appearance of the TRACE loops by 30-40 minutes. Second, the TRACE and SXT loops had different shapes and different footpoints. Third, the SXT loops were longer and higher than the TRACE loops. We conclude that the TRACE and the SXT loops were formed independently. TRACE loops were mainly heated at their footpoints, while SXT loops brightened in response to coronal magnetic reconnection. In summary, we observed a variety of coupled activity, from the photosphere to the active-region corona. Links between different aspects of this activity lead to a unified picture of the evolution and the energy release in the active region.

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Cited by 19 publications

References 7 publications

The role of magnetic bald patches in surges and arch filament systems

The role of magnetic bald patches in surges and arch filament systems

Physics of Solar Prominences: II—Magnetic Structure and Dynamics

Emerging Flux and the Heating of Coronal Loops

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