Proceedings of the International Astronomical Union

Table of Contents - 2007 - Volume 3, Symposium S247 (Waves & Oscillations in the Solar Atmosphere: Heating and Magneto-Seismology)  

Contributed Papers

HXR photospheric footprints

J. C. Martínez-Oliverosa1, A.-C. Doneaa1 and P. S. Callya1

a1 Centre for Stellar and Planetary Astrophysics, School of Mathematical Sciences Monash University, VIC 3800, Australia email:Juan.Oliveros@sci.monash.edu.au

Abstract

We have analysed the 6 mHz egression power signatures of some accoustically active X-class solar flares. During the impulsive phase these flares produced conspicuous seismic signatures which have kernel-like structures, mostly aligned with the neutral line of the host active region. The kernel-like structures show the effect of constructive interference of the acoustic waves emanating from the complex sources, suggesting motion of the acoustic sources. The co-aligment between the seismic signatures and the hard X-ray emission observed by RHESSI from the footpoints of the coronal loops suggests a direct link between relativistic particles accelerated during the flare and the hydrodynamic response of the photosphere during flares.

Keywords

  • Sun: X-rays;
  • Sun: particle acceleration;
  • Sun: helioseismology;
  • Sun: sun quakes;
  • Sun: solar flares
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