Evolution of magnetic flux in an isolated reconnection process

Hornig, G.; Priest, E. R.

doi:10.1063/1.1580120

Cited by 80 publications

(107 citation statements)

References 8 publications

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“…In 3D, however, no unique line exists at which the flux is split and reconnected (Hornig & Priest 2003). Within the current sheet, every field line constantly changes its connection.…”

Section: Resultsmentioning

confidence: 99%

Multiple eruptions from magnetic flux emergence

MacTaggart

Hood

2009

A&A

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Aims. In this paper we study the effects of a toroidal magnetic flux tube emerging into a magnetized corona, with an emphasis on large-scale eruptions. The orientation of the fields is such that the two flux systems are almost antiparallel when they meet. Methods. We follow the dynamic evolution of the system by solving the 3D MHD equations using a Lagrangian remap scheme. Results. Multiple eruptions are found to occur. The physics of the trigger mechanisms is discussed and related to well-known eruption models.

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“…In 3D, however, no unique line exists at which the flux is split and reconnected (Hornig & Priest 2003). Within the current sheet, every field line constantly changes its connection.…”

Section: Resultsmentioning

confidence: 99%

Multiple eruptions from magnetic flux emergence

MacTaggart

Hood

2009

A&A

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“…If reconnection is occuring in this localized region, it may take the form of slippage between the field lines (e.g. Hornig & Priest 2003). This may also be sign of magnetic diffusion on a larger scale.…”

Section: Parallel Electric Fields and Reconnectionmentioning

confidence: 99%

Flux emergence within mature solar active regions

MacTaggart¹

2011

A&A

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Aims. Recent insterest in flux emergence within mature active regions has led to several observational studies. Our aim is to model such a scenario and investigate the evolution of the system. Methods. We solve the 3D MHD equations numerically with a Lagrangian-remap scheme. The mature active region is modelled, in the initial condition, with a potential field. The smaller emerging region is a twisted flux tube and is placed between the two polarities of the mature region. The polarities of the new flux are aligned the same way as those of the mature region. The new flux emerges closer to the main negative polarity than the main positive polarity. To investigate the effects of reconnection, the distribution of the parallel electric field is calculated throughout the simulation. The topology of the magnetic field is then studied in regions of interest indicated by the electric field distribution. Results. The expansion of the new negative polarity is restricted due to the curvature of the overlying field and also because it is of the same sign. Reconnection is found to be strongest at low heights (below the corona) and along the outer side of the new positive polarity and its magnetic tongue. The effect of reconnection, in combination with the pressure between the two flux systems, is to resist the expansion of the new flux. The system then relaxes. Large-scale eruptions, such as CMEs, are not expected from the setup considered. At the new negative polarity, the high magnetic pressure can generate strong parallel electric fields which may lead to localized reconnection. The results of the model are in qualitative agreement with observations.

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“…Mackay et al, 2010;Mackay and Yeates, 2012). Furthermore, three-dimensional (3D) reconnection naturally tends to create twist (Berger and Field, 1984;Hornig and Priest, 2003;Priest, Longcope, and Janvier, 2016).…”

Section: Introductionmentioning

confidence: 99%

Flux Rope Formation Due to Shearing and Zipper Reconnection

2018

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Zipper reconnection has been proposed as a mechanism for creating most of the twist in the flux tubes that are present prior to eruptive flares and coronal mass ejections. We have conducted a first numerical experiment on this new regime of reconnection, where two initially untwisted parallel flux tubes are sheared and reconnected to form a large flux rope. We describe the properties of this experiment, including the linkage of magnetic flux between concentrated flux sources at the base of the simulation, the twist of the newly formed flux rope, and the conversion of mutual magnetic helicity in the sheared pre-reconnection state into the self-helicity of the newly formed flux rope.

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Evolution of magnetic flux in an isolated reconnection process

Cited by 80 publications

References 8 publications

Multiple eruptions from magnetic flux emergence

Multiple eruptions from magnetic flux emergence

Flux emergence within mature solar active regions

Flux Rope Formation Due to Shearing and Zipper Reconnection

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