Ideal MHD Instabilities, with a Focus on the Rayleigh–Taylor and Kelvin–Helmholtz Instabilities

2019 ◽  
pp. 1-36
Author(s):  
Andrew Hillier
Keyword(s):  
Mhd Instabilities ◽  
Ideal Mhd

scholarly journals Can Multi-threaded Flux Tubes in Coronal Arcades Support a Magnetohydrodynamic Avalanche?

Solar Physics ◽  
2021 ◽  
Vol 296 (8) ◽  
Author(s):  
J. Threlfall ◽  
J. Reid ◽  
A. W. Hood
Keyword(s):  
Magnetic Fields ◽  
Three Dimensional ◽  
Coronal Loops ◽  
Flux Tubes ◽  
Single Thread ◽  
Mhd Instabilities ◽  
Mhd Instability ◽  
Mhd Simulations ◽  
Ideal Mhd ◽  
Model Geometry

AbstractMagnetohydrodynamic (MHD) instabilities allow energy to be released from stressed magnetic fields, commonly modelled in cylindrical flux tubes linking parallel planes, but, more recently, also in curved arcades containing flux tubes with both footpoints in the same photospheric plane. Uncurved cylindrical flux tubes containing multiple individual threads have been shown to be capable of sustaining an MHD avalanche, whereby a single unstable thread can destabilise many. We examine the properties of multi-threaded coronal loops, wherein each thread is created by photospheric driving in a realistic, curved coronal arcade structure (with both footpoints of each thread in the same plane). We use three-dimensional MHD simulations to study the evolution of single- and multi-threaded coronal loops, which become unstable and reconnect, while varying the driving velocity of individual threads. Experiments containing a single thread destabilise in a manner indicative of an ideal MHD instability and consistent with previous examples in the literature. The introduction of additional threads modifies this picture, with aspects of the model geometry and relative driving speeds of individual threads affecting the ability of any thread to destabilise others. In both single- and multi-threaded cases, continuous driving of the remnants of disrupted threads produces secondary, aperiodic bursts of energetic release.

scholarly journals Ideal MHD instabilities for coronal mass ejections: interacting current channels and particle acceleration

2019 ◽  
Vol 3 (1) ◽  
Author(s):  
Rony Keppens ◽  
Yang Guo ◽  
Kirit Makwana ◽  
Zhixing Mei ◽  
Bart Ripperda ◽  
...  
Keyword(s):  
Particle Acceleration ◽  
Coronal Mass Ejections ◽  
Mhd Instabilities ◽  
Ideal Mhd

WKB estimates for the onset of ideal MHD instabilities in solar coronal loops

Solar Physics ◽  
1994 ◽  
Vol 150 (1-2) ◽  
pp. 99-115 ◽  
Author(s):  
A. W. Hood ◽  
P. De Bruyne ◽  
R. A. M. Van Der Linden ◽  
M. Goossens
Keyword(s):  
Coronal Loops ◽  
Mhd Instabilities ◽  
Ideal Mhd ◽  
Solar Coronal

The beta limit in the Advanced Toroidal Facility due to local ideal MHD instabilities

1989 ◽  
Vol 29 (4) ◽  
pp. 617-627 ◽  
Author(s):  
W.A. Cooper ◽  
S.P. Hirshman ◽  
D.K. Lee
Keyword(s):  
Mhd Instabilities ◽  
Ideal Mhd

scholarly journals Magnetic Equilibria and Instabilities

1989 ◽  
Vol 104 (1) ◽  
pp. 347-360
Author(s):  
Takashi Sakurai
Keyword(s):  
Solar Flares ◽  
Multiple Solutions ◽  
Magnetic Energy ◽  
Slow Phase ◽  
Two Dimensional ◽  
Explosive Energy ◽  
Mhd Instabilities ◽  
Ideal Mhd ◽  
Slow Evolution ◽  
Equilibrium Sequence

AbstractSolar flares are understood as a process of explosive liberation of magnetic energy, coming after a slow phase of energy build-up. The slow evolution of magnetic equilibria may end up with (a) the termination of an equilibrium sequence, or (b) an instability. The distinction between the two can be made by drawing schematic potential curves. Case (a) has been extensively studied in two-dimensional models. The appearance of multiple solutions, or disappearance of a solution takes place as the system evolves away from the current-free configuration. Case (b) can be discussed in terms of ideal MHD or resistive MHD instabilities. A possible route to explosive energy release is suggested by combining these two cases.

Ideal MHD Instabilities with Finite β-Effect in Reversed Field Pinch

1989 ◽  
Vol 58 (2) ◽  
pp. 473-481 ◽  
Author(s):  
Akihide Fujisawa ◽  
Shori Onodera ◽  
Kenro Miyamoto
Keyword(s):  
Reversed Field Pinch ◽  
Mhd Instabilities ◽  
Ideal Mhd ◽  
Reversed Field

scholarly journals Low-n global ideal MHD instabilities in the CFETR baseline scenario

2020 ◽  
Vol 62 (8) ◽  
pp. 085016
Author(s):  
Rui HAN ◽  
Ping ZHU ◽  
Debabrata BANERJEE ◽  
Shikui CHENG ◽  
Xingting YAN ◽  
...  
Keyword(s):  
Baseline Scenario ◽  
Mhd Instabilities ◽  
Ideal Mhd
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