Acoustic Oscillations in Solar and Stellar Flaring Loops

Kelly, A. and Nakariakov, V. M. and Arber, T.D. (2005) Acoustic Oscillations in Solar and Stellar Flaring Loops. In: British-Romanian-Hungarian N+N+N Workshop for Young Researchers On Plasma- and Astrophysics: from laboratory to outer space Edited by I. Ballai, E. Forgács-Dajka, A. Marcu and K. Petrovay. Publications of the Astronomy Department of the Eötvös University (15). ELTE Sokszorosítóüzeme, Budapest, pp. 125-132.

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Abstract

Observations of flaring loops in radio, visible and x-ray bands show quasi-periodic pulsations with periods from a few seconds to several minutes. Recent numerical studies have shown that some of these oscillations can be interpreted as standing slow magnetoacoustic waves. Energy deposition from the flare excites the second standing harmonic, with a period determined by the temperature and loop length. The excited longitudinal oscillations can be practically dissipationless and can, possibly, be considered MHD autowaves. Numerical simulations with a wide range of flare durations and choices of heat deposition location show that the second harmonic is a common feature of flaring loops.

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