Astronomy and Astrophysics – Astronomy
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011spd....42.2107k&link_type=abstract
American Astronomical Society, SPD meeting #42, #21.07; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
The X2.2 flare of February 15, 2011, produced powerful waves traveling in the solar interior and atmosphere, which were observed with the HMI and AIA instruments on SDO. These data provide a unique opportunity for high-resolution spatial and spectral analyses of the helioseismic and atmospheric responses and their relationship to the flare energy release. In particular, the analysis of the SDO/HMI and X-ray data from RHESSI shows that the helioseismic waves were initiated by the photospheric impact in the early impulsive phase, observed prior to the hard X-ray (50-100 keV) impulse, and were probably associated with atmospheric heating by relatively low-energy electrons (6-50 keV) and heat flux transport. The impact caused a short wave-like motion in the sunspot penumbra prior to the appearance of the helioseismic wave. The AIA observations revealed for the first time the propagation of this wave in the upper atmosphere, and the accompanying shock wave. The multi-instrument observations of the flare-excited waves open new perspectives for studying the energy release and transport in solar flares, and also for the magnetic field seismology in active regions.
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