Triggering of twists in solar prominence threads

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Triggering of twists in solar prominence threads. / Taroyan, Youra; Soler, R.

In: Astronomy and Astrophysics, Vol. 631, A144, 08.11.2019.

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Taroyan, Youra ; Soler, R. / Triggering of twists in solar prominence threads. In: Astronomy and Astrophysics. 2019 ; Vol. 631.

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@article{8858ceaaabf249548ff082f7d1ed5ca9,
title = "Triggering of twists in solar prominence threads",
abstract = "Magnetic twists are commonly associated with solar prominences. Twists are believed to play an important role in supporting the dense plasma against gravity as well as in prominence eruptions and coronal mass ejections, which may have a severe impact on the Earth and its near environment.We used a simple model to mimic the formation of a prominence thread by plasma condensation with the aim of investigating the possibility of triggering twists during this process. Temporal and spatial evolution of torsional Alfvenic perturbations driven by random photospheric motions was analysed using the linearised governing equations of motion and induction. We find that small amplitude perturbations are exponentially amplified in time as they propagate along the condensing thread. Mechanisms contributing to the rapid growth are explored. The result of the amplification process is the generation of large amplitude axisymmetric twists along the thread. Magnetic twists may be triggered along a prominence thread when it is permeated by a converging flow, for example, during the evaporation and condensation of plasma along the thread. This may lead to the generation of vortices in the non-linear regime.",
keywords = "sun: atmosphere, sun: filaments, magnetohydrodynamics (MHD), waves, instabilities",
author = "Youra Taroyan and R. Soler",
year = "2019",
month = "11",
day = "8",
doi = "10.1051/0004-6361/201936465",
language = "English",
volume = "631",
journal = "Astronomy and Astrophysics",
issn = "0004-6361",
publisher = "EDP Sciences",

}

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TY - JOUR

T1 - Triggering of twists in solar prominence threads

AU - Taroyan, Youra

AU - Soler, R.

PY - 2019/11/8

Y1 - 2019/11/8

N2 - Magnetic twists are commonly associated with solar prominences. Twists are believed to play an important role in supporting the dense plasma against gravity as well as in prominence eruptions and coronal mass ejections, which may have a severe impact on the Earth and its near environment.We used a simple model to mimic the formation of a prominence thread by plasma condensation with the aim of investigating the possibility of triggering twists during this process. Temporal and spatial evolution of torsional Alfvenic perturbations driven by random photospheric motions was analysed using the linearised governing equations of motion and induction. We find that small amplitude perturbations are exponentially amplified in time as they propagate along the condensing thread. Mechanisms contributing to the rapid growth are explored. The result of the amplification process is the generation of large amplitude axisymmetric twists along the thread. Magnetic twists may be triggered along a prominence thread when it is permeated by a converging flow, for example, during the evaporation and condensation of plasma along the thread. This may lead to the generation of vortices in the non-linear regime.

AB - Magnetic twists are commonly associated with solar prominences. Twists are believed to play an important role in supporting the dense plasma against gravity as well as in prominence eruptions and coronal mass ejections, which may have a severe impact on the Earth and its near environment.We used a simple model to mimic the formation of a prominence thread by plasma condensation with the aim of investigating the possibility of triggering twists during this process. Temporal and spatial evolution of torsional Alfvenic perturbations driven by random photospheric motions was analysed using the linearised governing equations of motion and induction. We find that small amplitude perturbations are exponentially amplified in time as they propagate along the condensing thread. Mechanisms contributing to the rapid growth are explored. The result of the amplification process is the generation of large amplitude axisymmetric twists along the thread. Magnetic twists may be triggered along a prominence thread when it is permeated by a converging flow, for example, during the evaporation and condensation of plasma along the thread. This may lead to the generation of vortices in the non-linear regime.

KW - sun: atmosphere

KW - sun: filaments

KW - magnetohydrodynamics (MHD)

KW - waves

KW - instabilities

U2 - 10.1051/0004-6361/201936465

DO - 10.1051/0004-6361/201936465

M3 - Article

VL - 631

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

SN - 0004-6361

M1 - A144

ER -

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