scholarly journals SPATIAL DAMPING OF PROPAGATING KINK WAVES DUE TO RESONANT ABSORPTION: EFFECT OF BACKGROUND FLOW

2011 ◽  
Vol 734 (2) ◽  
pp. 80 ◽  
Author(s):  
R. Soler ◽  
J. Terradas ◽  
M. Goossens
Keyword(s):  
Resonant Absorption ◽  
Background Flow ◽  
Absorption Effect ◽  
Kink Waves ◽  
Spatial Damping

Plasma Passive Jamming for SAR Based on the Resonant Absorption Effect

2018 ◽  
Vol 46 (4) ◽  
pp. 928-933 ◽  
Author(s):  
Ruijia Wang ◽  
Xing Wang ◽  
Siyi Cheng ◽  
Yueyu Meng ◽  
Guanrong Zhang ◽  
...  
Keyword(s):  
Resonant Absorption ◽  
Absorption Effect

scholarly journals The damping of transverse oscillations of prominence threads: a comparative study

2013 ◽  
Vol 8 (S300) ◽  
pp. 48-51 ◽  
Author(s):  
Roberto Soler ◽  
Ramon Oliver ◽  
Jose Luis Ballester
Keyword(s):  
Comparative Study ◽  
Thermal Conduction ◽  
Resonant Absorption ◽  
Radiative Cooling ◽  
Magnetohydrodynamic Waves ◽  
Physical Mechanisms ◽  
Solar Prominences ◽  
Kink Waves ◽  
Conduction Cooling ◽  
Transverse Oscillations

AbstractTransverse oscillations of thin threads in solar prominences are frequently reported in high-resolution observations. The typical periods of the oscillations are in the range of 3 to 20 min. A peculiar feature of the oscillations is that they are damped in time, with short damping times corresponding to few periods. Theoretically, the oscillations are interpreted as kink magnetohydrodynamic waves. However, the mechanism responsible for the damping is not well known. Here we perform a comparative study between different physical mechanisms that may damp kink waves in prominence threads. The considered processes are thermal conduction, cooling by radiation, resonant absorption, and ion-neutral collisions. We find that thermal conduction and radiative cooling are very inefficient for the damping of kink waves. The effect of ion-neutral collisions is minor for waves with periods usually observed. Resonant absorption is the only process that produces an efficient damping. The damping times theoretically predicted by resonant absorption are compatible with those reported in the observations.

scholarly journals SPATIAL DAMPING OF PROPAGATING KINK WAVES IN PROMINENCE THREADS

2010 ◽  
Vol 726 (2) ◽  
pp. 102 ◽  
Author(s):  
R. Soler ◽  
R. Oliver ◽  
J. L. Ballester
Keyword(s):  
Kink Waves ◽  
Spatial Damping

Damping of magnetohydrodynamic waves by resonant absorption in the solar atmosphere

2005 ◽  
Vol 364 (1839) ◽  
pp. 433-446 ◽  
Author(s):  
M Goossens ◽  
J Andries ◽  
I Arregui
Keyword(s):  
Resonant Absorption ◽  
Mhd Waves ◽  
Coronal Loops ◽  
Two Dimensional ◽  
Heliospheric Observatory ◽  
Magnetohydrodynamic Waves ◽  
One Dimensional ◽  
Magnetic Structures ◽  
Different Types ◽  
Kink Waves

In the last decade we have been overwhelmed by an avalanche of discoveries of magnetohydrodynamic (MHD) waves by the Solar and Heliospheric Observatory and Transition Region and Coronal Explorer observatories. Both standing and propagating versions of fast magnetoacoustic and slow magnetoacoustic MHD waves have been detected. Information on the damping times and damping distances of these waves is less detailed and less accurate than that on periods and amplitudes. Nevertheless, observations show the damping times and damping lengths are often short. Also, different types of MHD waves in different types of magnetic structures likely require different damping mechanisms. The phenomenon of fast damping is well documented for the standing fast magnetosonic kink waves in coronal loops. This paper concentrates on standing fast magnetosonic waves. It reports on results on periods and damping times due to resonant absorption in one-dimensional and two-dimensional models of coronal loops. Special attention is given to multiple modes.

scholarly journals Resonant absorption of kink oscillations in coronal flux tubes with continuous magnetic twist

2019 ◽  
Vol 490 (2) ◽  
pp. 1644-1651 ◽  
Author(s):  
Zanyar Ebrahimi ◽  
Karam Bahari
Keyword(s):  
Magnetic Field ◽  
Resonant Absorption ◽  
Realistic Model ◽  
Mhd Equations ◽  
Flux Tubes ◽  
Kink Mode ◽  
Background Magnetic Field ◽  
Inhomogeneous Density ◽  
Kink Wave ◽  
Kink Waves

ABSTRACT There are observational evidences for the existence of twisted magnetic field in the solar corona. Here, we have investigated resonant damping of the magnetohydrodynamic (MHD) kink waves in magnetic flux tubes. A realistic model of the tube with continuous magnetic twist and radially inhomogeneous density profile has been considered. We have obtained the dispersion relation of the kink wave using the solution to the linear MHD equations outside the density inhomogeneity and the appropriate connection formula to the solutions across the thin transitional boundary layer. The dependence of the oscillation frequency and damping rate of the waves on the twist parameter and longitudinal wavenumber has been investigated. For the flux tube parameters considered in this paper, we obtain rapid damping of the kink waves comparable to the observations. In order to justify this rapid damping, depending on the sign of the azimuthal kink mode number, $m=+1$ or $-1$, the background magnetic field must have left- or right-handed twisted profile, respectively. For the model considered here, the resonant absorption occurs only when the twist parameter is in a range specified by the density contrast.

scholarly journals Spatial damping of propagating kink waves due to mode coupling

2012 ◽  
Vol 539 ◽  
pp. A37 ◽  
Author(s):  
D. J. Pascoe ◽  
A. W. Hood ◽  
I. De Moortel ◽  
A. N. Wright
Keyword(s):  
Mode Coupling ◽  
Kink Waves ◽  
Spatial Damping
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