Guide Modes in Threedimensional Topological Insulator Waveguide Induced by Magnetic Fields

2013 ◽  
Vol 42 (5) ◽  
pp. 564-569
Author(s):  
徐谊 XU Yi ◽  
何英 HE Ying ◽  
杨艳芳 YANG Yanfang
Solar Physics ◽  
2021 ◽  
Vol 296 (8) ◽  
Author(s):  
J. Threlfall ◽  
J. Reid ◽  
A. W. Hood

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.


2021 ◽  
Vol 103 (7) ◽  
Author(s):  
Kristof Moors ◽  
Peter Schüffelgen ◽  
Daniel Rosenbach ◽  
Tobias Schmitt ◽  
Thomas Schäpers ◽  
...  

2005 ◽  
Vol 109 (28) ◽  
pp. 13445-13450 ◽  
Author(s):  
Wenyong Duan ◽  
Shu Kitamura ◽  
Ichiro Uechi ◽  
Akio Katsuki ◽  
Yoshifumi Tanimoto

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