Helioseismic and Photospheric Effects of Solar Flares

Details Helioseismic and Photospheric Effects of Solar Flares Helioseismic and Photospheric Effects of Solar Flares

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006spd....37.0825k&link_type=abstract

American Astronomical Society, SPD meeting #37, #8.25; Bulletin of the American Astronomical Society, Vol. 38, p.235

Astronomy and Astrophysics

Astronomy

Scientific paper

I present a detailed analysis of new observations ofhelioseismic waves ('sunquakes') generated by solarflares, using SOHO/MDI and RHESSI data. Theseobservations show a close association between theflare seismic waves and the hard X-ray source,indicating that high-energy electrons acceleratedduring the flare impulsive phase produced strongcompression waves in the photosphere, causing thesunquake. The results also reveal new physicalproperties such as strong anisotropy of the seismicwaves, the amplitude of which varies significantlywith the direction of propagation. The waves travelthrough surrounding sunspot regions to largedistances, up to 120 Mm, without significant decay.They provide new diagnostics of sunspot regions. Inaddition, I discuss whether high-energy electrons orprotons are the prime cause of these effects.

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