Acoustic Oscillations in Solar and Stellar Flaring Loops

Details Acoustic Oscillations in Solar and Stellar Flaring Loops Acoustic Oscillations in Solar and Stellar Flaring Loops

Jun 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005padeu..15..125k&link_type=abstract

In: Proceedings of the British-Romanian-Hungarian N+N+N Workshop for Young Researchers on Plasma- and Astrophysics: from laborat

Astronomy and Astrophysics

Astrophysics

Scientific paper

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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