Modeling of two-ribbon flares by the fast reconnection mechanism

Journal Article · Mon Oct 15 04:00:00 EDT 2007 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.2789982· OSTI ID:21062028

Ugai, M ^[1]

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1. Graduate School of Science and Engineering, Ehime University, Matsuyama 790-8577 (Japan)

The three-dimensional (3D) spontaneous fast reconnection model is applied to explosive heating in the shape of a pair of ribbons observed in the solar chromosphere, where plasma density is much larger than in the solar corona. In accordance with the onset of fast reconnection in the corona, 3D magnetic field dipolarization is caused by the fast reconnection jet, so that an extreme increase in the chromospheric current density suddenly occurs in a pair of local regions near the separatrix layers because of large-scale redistribution of the current system. Accordingly, chromospheric joule heating impulsively occurs in the thin layers, and the joule heating is interpreted to be sustained by a generator in the coronal fast reconnection region, in the form of u{center_dot}(JxB)<0, provided by the fast reconnection jet ahead of the magnetic loop. Hence, the chromospheric temperature is drastically enhanced in a pair of local regions, which move away with time, eventually leading to definite chromospheric evaporation; simultaneously, the coronal flare loop is expanding outward. These results are consistent with the well-known morphological features of two-ribbon flares.

• OSTI ID: 21062028
• Journal Information: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 10 Vol. 14; ISSN PHPAEN; ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ASTROPHYSICS
CHROMOSPHERE
CURRENT DENSITY
CURRENTS
EVAPORATION
JOULE HEATING
LAYERS
MAGNETIC FIELDS
MAGNETIC RECONNECTION
MAGNETISM
PLASMA
PLASMA DENSITY
SHAPE
SIMULATION
SOLAR CORONA
SOLAR FLARES