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Paper Information

Journal:   IRANIAN JOURNAL OF PHYSICS RESEARCH   WINTER 2018 , Volume 17 , Number 5 ; Page(s) 691 To 697.
 
Paper: 

EXCITATION AND DAMPING OF TRANSVERSAL OSCILLATION IN CORONAL LOOPS BY WAKE PHENOMENA

 
 
Author(s):  ABEDINI A.*
 
* DEPARTMENT OF PHYSICS, UNIVERSITY OF QOM, QOM, IRAN
 
Abstract: 

Transversal oscillation of coronal loops that are interpreted as signatures of magneto hydrodynamics (MHD) waves are observed frequently in active region corona loops. The amplitude damping of transversal oscillation has been found to be strong. The damping of transversal oscillation may be produced by the dissipation mechanism or by the wake of the traveling disturbance. The damping of transversal loop oscillations with wake phenomena is not related to any dissipation mechanism. Also, these kinds of coronal loop oscillations are not related to the kink mode, although this mode can be occurred by the energy released from dissipation wave packet in the loop. In this paper, the excitation and damping of transversal oscillations of coronal loops with wake phenomena is discussed in detail, both theoretically and observationally. Here, the transversal coronal loop oscillations are modeled with a one dimensional simple line-tied straight charge tube, which is fixed on both sides. The dynamics of the loop and the coronal is governed by the Klein–Gordon differential equation. A localized disturbance that can be generated by a nearby flare produces a perturbation that undergoes dispersion as it propagates toward the loop. As a consequence, the amplitudes of oscillates decay with time roughly t-1/2 at the external cutoff frequency. Data used in this study are comprised of images taken by Atmospheric Imaging Assembly (AIA) on-board Solar Dynamics Observatory (SDO). These observed data, taken from the loops of a nearby flare, with an interval of 24 seconds in the 171 A0 pass band, is analyzed for evidence of excitation and damping of transverse oscillations of coronal loop that is situated near a flare. In this analysis, signatures of transverse oscillations that are damped rapidly were found, with periods in the range of P=18.5-23.85 minutes. Furthermore, oscillation of loop segments attenuate with time roughly as t-a in that, average values of ? for four different loops change form 0.65-0.80. The average values of a are in good agreement with theoretical prediction which considers wake phenomena responsible for the rapid damping of the observed transversal oscillations in coronal loops.

 
Keyword(s): CORONAL, WAKE PHENOMENA, DAMPING TIME OF TRANSVERSE OSCILLATIONS
 
 
References: 
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Citations: 
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APA: Copy

ABEDINI, A. (2018). EXCITATION AND DAMPING OF TRANSVERSAL OSCILLATION IN CORONAL LOOPS BY WAKE PHENOMENA. IRANIAN JOURNAL OF PHYSICS RESEARCH, 17(5 ), 691-697. https://www.sid.ir/en/journal/ViewPaper.aspx?id=573286



Vancouver: Copy

ABEDINI A.. EXCITATION AND DAMPING OF TRANSVERSAL OSCILLATION IN CORONAL LOOPS BY WAKE PHENOMENA. IRANIAN JOURNAL OF PHYSICS RESEARCH. 2018 [cited 2021July27];17(5 ):691-697. Available from: https://www.sid.ir/en/journal/ViewPaper.aspx?id=573286



IEEE: Copy

ABEDINI, A., 2018. EXCITATION AND DAMPING OF TRANSVERSAL OSCILLATION IN CORONAL LOOPS BY WAKE PHENOMENA. IRANIAN JOURNAL OF PHYSICS RESEARCH, [online] 17(5 ), pp.691-697. Available: https://www.sid.ir/en/journal/ViewPaper.aspx?id=573286.



 
 
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