HELICAL KINK INSTABILITY IN A CONFINED SOLAR ERUPTION

ABSTRACT A model for strongly writhing confined solar eruptions suggests an origin in the helical kink instability of a coronal flux rope that remains stable against the torus instability. This model is tested against the well observed filament eruption on 2002 May 27 in a parametric MHD simulation...

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Bibliographic Details
Published in:The Astrophysical journal 2016-12, Vol.832 (2), p.106
Main Authors: Hassanin, Alshaimaa, Kliem, Bernhard
Format: Article
Language:English
Subjects:
Astrophysics
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
COMPARATIVE EVALUATIONS
Computer simulation
COMPUTERIZED SIMULATION
Current sheets
DISSOLUTION
Eruptions
Fluctuations
Flux
Homology
instabilities
Instability
KINK INSTABILITY
MAGNETIC FIELDS
MAGNETIC RECONNECTION
MAGNETOHYDRODYNAMICS
magnetohydrodynamics (MHD)
MASS
Model testing
ORIGIN
SPACE
Stability
STELLAR CORONAE
STELLAR FLARES
SUN
Sun: corona
Sun: coronal mass ejections (CMEs)
Sun: flares
Sun: magnetic fields
Toruses
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Summary:ABSTRACT A model for strongly writhing confined solar eruptions suggests an origin in the helical kink instability of a coronal flux rope that remains stable against the torus instability. This model is tested against the well observed filament eruption on 2002 May 27 in a parametric MHD simulation study that comprises all phases of the event. Good agreement with the essential observed properties is obtained. These include the confinement, terminal height, writhing, distortion, and dissolution of the filament, and the flare loops. The agreement is robust against variations in a representative range of parameter space. Careful comparisons with the observation data constrain the ratio of the external toroidal and poloidal field components to and the initial flux rope twist to . Different from ejective eruptions, two distinct phases of strong magnetic reconnection can occur. First, the erupting flux is cut by reconnection with overlying flux in the helical current sheet formed by the instability. If the resulting flux bundles are linked as a consequence of the erupting rope's strong writhing, they subsequently reconnect in the vertical current sheet between them. This reforms the overlying flux and a far less twisted flux rope, offering a pathway to homologous eruptions.
ISSN:0004-637X
1538-4357
DOI:10.3847/0004-637X/832/2/106