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Acoustic Oscillations in Solar and Stellar Flaring Loops View all abstracts by submitter

Valery Nakariakov   Submitted: 2003-12-22 02:58

Evolution of a coronal loop in response to an impulsive energy release is numerically modelled. It is shown that the loop density evolution curves exhibit quasi-periodic perturbations with the periods given approximately by the ratio of the loop length to the average sound speed, associated with the second standing harmonics of an acoustic wave. The density perturbations have a maximum near the loop apex. The corresponding field-aligned flows have a node near the apex. We suggest that the quasi-periodic pulsations with periods in the range 10-300 s, frequently observed in flaring coronal loops in the radio, visible light and X-ray bands, may be produced by the second standing harmonic of the acoustic mode.

Authors: V.M. Nakariakov, D. Tsiklauri, A. Kelly, T.D. Arber, M.J. Aschwanden

Publication Status: Astron.Astrophys. 414 (2004) L25-L28
Last Modified: 2010-12-14 09:29
Go to main E-Print page  Magnetic Field, Halpha and RHESSI Observations of the July 23, 2002
Gamma-ray Flare  Time signatures of impulsively generated coronal fast wave trains  Edit Entry  Download Preprint  Submitter's Homepage Delete Entry 

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