Magnetic reconnection in solar flares and corresponding radio bursts

Karlický, M.; Bárta, M.

doi:10.1016/j.asr.2006.11.019

Cited by 6 publications

(2 citation statements)

References 20 publications

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“…The analysis of such non-regular cusp structures in the literature were performed either analytically (e.g., Vekstein & Priest 1992, 1993Uzdensky & Kulsrud 1997;Wiegelmann et al 1998Wiegelmann et al , 2000 or based on numerical simulations (e.g., Karlický & Bárta 2007). In all these investigations the inner structure of the current distribution was neglected.…”

Section: Current Sheetmentioning

confidence: 99%

Topological Structures of Velocity and Electric Field in the Vicinity of a Cusp-type Magnetic Null Point

Nickeler

Karlický

Kraus

2019

ApJ

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Topological characteristics reveal important physical properties of plasma structures and astrophysical processes. Physical parameters and constraints are linked with topological invariants, which are important for describing magnetic reconnection scenarios. We analyze stationary non-ideal Ohm's law concerning the Poincaré classes of all involved physical fields in 2D by calculating the corresponding topological invariants of their Jacobian (here: particularly the eigenvalues) or Hessian matrices. The magnetic field is assumed to have a cusp structure, and the stagnation point of the plasma flow coincides with the cusp. We find that the stagnation point must be hyperbolic. Furthermore, the functions describing both the resistivity and the Ohmic heating have a saddle point structure, being displaced with respect to the cusp point. These results imply that there is no monotonous relation between current density and anomalous resistivity in the case of a 2D standard magnetic cusp.

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Section: Current Sheetmentioning

confidence: 99%

Topological Structures of Velocity and Electric Field in the Vicinity of a Cusp-type Magnetic Null Point

Nickeler

Karlický

Kraus

2019

ApJ

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“…The fast particles moving from the lower to the higher corona are seized in the magnetic trap and give off the type III-like bursts in absorption with negative drift. Karlický & Bárta (2007) found that electrons are accelerated most efficiently in the region near the X-point of the magnetic reconnection at the end of the tearing process and the beginning of the restoration of the magnetic configuration.…”

Section: December 13 Eventmentioning

confidence: 99%

Recent results of zebra patterns in solar radio bursts

Chernov

2010

Res. Astron. Astrophys.

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This review covers the most recent experimental results and theoretical research on zebra patterns (ZPs) in solar radio bursts. The basic attention is given to events with new peculiar elements of zebra patterns received over the last few years. All new properties are considered in light of both what was known earlier and new theoretical models. Large-scale ZPs consisting of small-scale fiber bursts could be explained by simultaneous inclusion of two mechanisms when whistler waves "highlight" the levels of double plasma resonance (DPR). A unique fine structure was observed in the event on 2006 December 13: spikes in absorption formed dark ZP stripes against the absorptive type III-like bursts. The spikes in absorption can appear in accordance with well known mechanisms of absorptive bursts. The additional injection of fast particles filled the loss-cone (breaking the loss-cone distribution), and the generation of the continuum was quenched at these moments. The maximum absorptive effect occurs at the DPR levels. The parameters of millisecond spikes are determined by small dimensions of the particle beams and local scale heights in the radio source. Thus, the DPR model helps to understand several aspects of unusual elements of ZPs. However, the simultaneous existence of several tens of the DPR levels in the corona is impossible for any realistic profile of the plasma density and magnetic field. Three new theories of ZPs are examined. The formation of eigenmodes of transparency and opacity during the propagation of radio waves through regular coronal inhomogeneities is the most natural and promising mechanism. Two other models (nonlinear periodic space -charge waves and scattering of fast protons on ion-sound harmonics) could happen in large radio bursts.

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Recent Results of Zebra Patterns in Solar Radio Bursts

Gennady¹,

Chernov²

2011

Astrophysics and Space Science Library

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Magnetic reconnection in solar flares and corresponding radio bursts

Cited by 6 publications

References 20 publications

Topological Structures of Velocity and Electric Field in the Vicinity of a Cusp-type Magnetic Null Point

Topological Structures of Velocity and Electric Field in the Vicinity of a Cusp-type Magnetic Null Point

Recent results of zebra patterns in solar radio bursts

Recent Results of Zebra Patterns in Solar Radio Bursts

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