Skip to Main content Skip to Navigation
Journal articles

Transition from eruptive to confined flares in the same active region

Abstract : Context. Solar flares are sudden and violent releases of magnetic energy in the solar atmosphere that can be divided into two classes: eruptive flares, where plasma is ejected from the solar atmosphere resulting in a coronal mass ejection (CME), and confined flares, where no CME is associated with the flare. Aims. We present a case study showing the evolution of key topological structures, such as spines and fans, which may determine the eruptive versus non-eruptive behavior of the series of eruptive flares followed by confined flares, which all originate from the same site. Methods. To study the connectivity of the different flux domains and their evolution, we compute a potential magnetic field model of the active region. Quasi-separatrix layers are retrieved from the magnetic field extrapolation.Results. The change in behavior of the flares from one day to the next – from eruptive to confined – can be attributed to the change in orientation of the magnetic field below the fan with respect to the orientation of the overlaying spine rather than an overall change in the stability of the large-scale field. Conclusions. Flares tend to be more confined when the field that supports the filament and the overlying field gradually becomes less anti-parallel as a direct result of changes in the photospheric flux distribution, being themselves driven by continuous shearing motions of the different magnetic flux concentrations.
Document type :
Journal articles
Complete list of metadata

Cited literature [86 references]  Display  Hide  Download

https://hal-obspm.ccsd.cnrs.fr/obspm-02268108
Contributor : La. Bibliotheque <>
Submitted on : Wednesday, November 4, 2020 - 1:34:59 AM
Last modification on : Monday, December 14, 2020 - 9:50:24 AM
Long-term archiving on: : Friday, February 5, 2021 - 6:09:52 PM

File

aa29836-16.pdf
Publication funded by an institution

Identifiers

Citation

F. Zuccarello, R. Chandra, B. Schmieder, G. Aulanier, R. Joshi. Transition from eruptive to confined flares in the same active region. Astronomy and Astrophysics - A&A, EDP Sciences, 2017, 601, pp.A26. ⟨10.1051/0004-6361/201629836⟩. ⟨obspm-02268108⟩

Share

Metrics

Record views

356

Files downloads

145