scholarly journals Long-Periodic Transverse Oscillations of Coronal Loops and Modulations of Solar Microwave Radiation

2011 ◽  
Author(s):  
M. L. Khodachenko
Keyword(s):  
Microwave Radiation ◽  
Coronal Loops ◽  
Solar Microwave ◽  
Transverse Oscillations

scholarly journals Possible manifestation of large-scale transverse oscillations of coronal loops in solar microwave emission

2010 ◽  
Vol 525 ◽  
pp. A105 ◽  
Author(s):  
M. L. Khodachenko ◽  
K. G. Kislyakova ◽  
T. V. Zaqarashvili ◽  
A. G. Kislyakov ◽  
M. Panchenko ◽  
...  
Keyword(s):  
Large Scale ◽  
Microwave Emission ◽  
Coronal Loops ◽  
Solar Microwave ◽  
Transverse Oscillations

scholarly journals Undamped transverse oscillations of coronal loops as a self-oscillatory process

2016 ◽  
Vol 591 ◽  
pp. L5 ◽  
Author(s):  
V. M. Nakariakov ◽  
S. A. Anfinogentov ◽  
G. Nisticò ◽  
D.-H. Lee
Keyword(s):  
Oscillatory Process ◽  
Coronal Loops ◽  
Transverse Oscillations

scholarly journals Excitation of decay-less transverse oscillations of coronal loops by random motions

2020 ◽  
Vol 633 ◽  
pp. L8 ◽  
Author(s):  
A. N. Afanasyev ◽  
T. Van Doorsselaere ◽  
V. M. Nakariakov
Keyword(s):  
Broad Band ◽  
Random Excitation ◽  
Forced Oscillations ◽  
Oscillatory Process ◽  
Coronal Loops ◽  
Alternative Mechanism ◽  
Steady Flows ◽  
Kink Waves ◽  
Random Motions ◽  
Transverse Oscillations

Context. The relatively large-amplitude decaying regime of transverse oscillations of coronal loops has been known for two decades and has been interpreted in terms of magnetohydrodynamic kink modes of cylindrical plasma waveguides. In this regime oscillations decay in several cycles. Recent observational analysis has revealed so-called decay-less, small-amplitude oscillations, in which a multi-harmonic structure has been detected. Several models have been proposed to explain these oscillations. In particular, decay-less oscillations have been described in terms of standing kink waves driven with continuous mono-periodic motions of loop footpoints, in terms of a simple oscillator model of forced oscillations due to harmonic external force, and as a self-oscillatory process due to the interaction of a loop with quasi-steady flows. However, an alternative mechanism is needed to explain the simultaneous excitation of several longitudinal harmonics of the oscillation. Aims. We study the mechanism of random excitation of decay-less transverse oscillations of coronal loops. Methods. With a spatially one-dimensional and time-dependent analytical model taking into account effects of the wave damping and kink speed variation along the loop, we considered transverse loop oscillations driven by random motions of footpoints. The footpoint motions were modelled by broad-band coloured noise. Results. We found the excitation of loop eigenmodes and analysed their frequency ratios as well as the spatial structure of the oscillations along the loop. The obtained results successfully reproduce the observed properties of decay-less oscillations. In particular, excitation of eigenmodes of a loop as a resonator can explain the observed quasi-monochromatic nature of decay-less oscillations and the generation of multiple harmonics detected recently. Conclusions. We propose a mechanism that can interpret decay-less transverse oscillations of coronal loops in terms of kink waves randomly driven at the loop footpoints.

scholarly journals Transverse oscillations in solar coronal loops induced by propagating Alfvénic pulses

2005 ◽  
Vol 431 (3) ◽  
pp. 1095-1104 ◽  
Author(s):  
L. Del Zanna ◽  
E. Schaekens ◽  
M. Velli
Keyword(s):  
Coronal Loops ◽  
Transverse Oscillations ◽  
Solar Coronal

scholarly journals Transverse oscillations of non-planar coronal loops

2011 ◽  
Vol 529 ◽  
pp. A33 ◽  
Author(s):  
M. S. Ruderman ◽  
A. Scott
Keyword(s):  
Coronal Loops ◽  
Transverse Oscillations
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