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Time signatures of impulsively generated coronal fast wave trains View all abstracts by submitter

Valery Nakariakov   Submitted: 2003-12-22 02:54

Impulsively-generated short-period fast magnetoacoustic wave trains, guided by solar and stellar coronal loops are numerically modelled. In the developed stage of the evolution, the wave trains have a characteristic quasi-periodic signature. The quasi-periodicity results from the geometrical dispersion of the guided fast modes, determined by the transverse profile of the loop. A typical feature of the signature is a lqlq tadpole'' wavelet spectrum: a narrow spectrum tail precedes a broad band head. The instantaneous period of the oscillations in the wave train decreases gradually with time. The period and the spectral amplitude evolution are shown to be determined by the steepness of the transverse density profile and the density contrast ratio in the loop. The propagating wave trains recently discovered with the SECIS instrument are pointed out to have similar wavelet spectral features, which strengthens the interpretation of SECIS results as guided fast wave trains.

Authors: V.M. Nakariakov, T.D. Arber, C.E. Ault, A.C. Katsiyannis, D.R. Williams, F.P. Keenan
Projects: None

Publication Status: MNRAS (in press)
Last Modified: 2003-12-22 02:54
Go to main E-Print page  Acoustic Oscillations in Solar and Stellar Flaring Loops  Statistical Properties of Flaring and Sub-Flaring Activity in the Solar Atmosphere  Edit Entry  Download Preprint  Submitter's Homepage Delete Entry 

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