Abstract
Multi-wavelength studies of energetic solar flares with seismic emissions have revealed interesting common features between them. We studied the first GOES X-class flare of Solar Cycle 24, as detected by the Solar Dynamics Observatory (SDO). For context, seismic activity from this flare (SOL2011-02-15T01:55-X2.2, in NOAA AR 11158) has been reported by Kosovichev (Astrophys. J. Lett., 734, L15, 2011) and Zharkov et al. (Astrophys. J. Lett., 741, L35, 2011). Based on Dopplergram data from the Helioseismic and Magnetic Imager (HMI), we applied standard methods of local helioseismology in order to identify the seismic sources in this event. RHESSI hard X-ray data are used to check the correlation between the location of the seismic sources and the particle-precipitation sites in during the flare. Using HMI magnetogram data, the temporal profile of fluctuations in the photospheric line-of-sight magnetic field is used to estimate the magnetic-field change in the region where the seismic signal was observed. This leads to an estimate of the work done by the Lorentz-force transient on the photosphere of the source region. In this instance, this is found to be a significant fraction of the acoustic energy in the attendant seismic emission, suggesting that Lorentz forces can contribute significantly to the generation of sunquakes. However, there are regions in which the signature of the Lorentz force is much stronger, but from which no significant acoustic emission emanates.
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Notes
Because B los varies considerably across the source region, the mean of B losΔB los can be considerably different from the product of the means used as a proxy in Equation (7). The error could be of order 100 %. However, we think that it is unlikely to be anything like an order of magnitude.
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Acknowledgements
The Berkeley group was supported by NASA under contract NNX11AP05G. Special thanks to K.D. Leka and Graham Barnes for their helpful comments and discussion to improve the ideas presented in this work.
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Advances in European Solar Physics
Guest Editors: Valery M. Nakariakov, Manolis K. Georgoulis, and Stefaan Poedts
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Alvarado-Gómez, J.D., Buitrago-Casas, J.C., Martínez-Oliveros, J.C. et al. Magneto-Acoustic Energetics Study of the Seismically Active Flare of 15 February 2011. Sol Phys 280, 335–345 (2012). https://doi.org/10.1007/s11207-012-0009-6
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DOI: https://doi.org/10.1007/s11207-012-0009-6