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Lyra Observations of two oscillation modes in a single flare

Lyra Observations of two oscillation modes in a single flare

Publication date: 04 October 2011

Authors: Van Doorsselaere, T. et al

Journal: The Astrophysical Journal
Volume: 740
Issue: 2
Page: 90
Year: 2011

Copyright: IOP Publishing Ltd.

We analyze light curves from the LYRA irradiance experiment on board PROBA2 during the flare of 2010 February 8. We see both long- and short-period oscillations during the flare. The long-period oscillation is interpreted in terms of standing slow sausage modes; the short-period oscillation is thought to be a standing fast sausage mode. The simultaneous presence of two oscillation modes in the same flaring structure allows for new coronal seismological applications. The periods are used to find seismological estimates of the plasma- beta and the density contrast of the flaring loop. Also the wave mode number is estimated from the observed periods.

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