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Forward modeling of hot loop oscillations observed by SUMER and SXT View all abstracts by submitter

Youra Taroyan   Submitted: 2007-04-04 07:43

An example of hot active region loop oscillations observed by SUMER and SXT is presented. The hypothesis that a fundamental mode standing slow sausage (acoustic) wave is initiated by a footpoint microflare is tested and confirmed using a foward modelling approach. The oscillation is set up immediately after the heating pulse. The duration, temporal behaviour and total heat input of the microflare are estimated using the oscillation parameters. The rapid energy release is followed by cooling. The time-distance profile of the heating rate along the loop is recovered using the intensity and Doppler shift time series. Hot loop oscillations are mainly observed in the Doppler shift. The absence of intensity oscillations in this and similar cases is explained. It is also found that the intensity oscillation, unlike the Doppler shift oscillation, undergoes half a period phase variation when the background intensity passes through its maximum, thus making it more difficult to detect.

Authors: Y. Taroyan, R. Erdelyi, T. J. Wang, S. J. Bradshaw
Projects: SoHO-SUMER

Publication Status: ApJ 659, L173-L176, 2007
Last Modified: 2007-04-06 12:26
Go to main E-Print page  Quantitative Forecasting of Major Solar Flares  Torsional oscillations of longitudinally inhomogeneous coronal loops  Edit Entry  Download Preprint  Submitter's Homepage Delete Entry 

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