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Comparison of seismic signatures of flares obtained by SOHO/MDI and GONG instruments View all abstracts by submitter

Sergei Zharkov   Submitted: 2011-07-12 09:19

The first observations of seismic responses to solar flares were carried out using time-distance (TD) and holography techniques applied to SOHO/Michelson Doppler Imager (MDI) Dopplergrams obtained from space and unaffected by terrestrial atmospheric disturbances. However, the ground-based network GONG is potentially a very valuable source of sunquake observations, especially in cases where space observations are unavailable. In this paper, we present an updated technique for pre-processing of GONG observations for the application of subjacent vantage holography. Using this method and TD diagrams, we investigate several sunquakes observed in association with M- and X-class solar flares and compare the outcomes with those reported earlier using MDI data. In both GONG and MDI data sets, for the first time, we also detect the TD ridge associated with the 2001 September 9 flare. Our results show reassuringly positive identification of sunquakes from GONG data that can provide further information about the physics of seismic processes associated with solar flares.

Authors: Zharkov S.I., Zharkova V.V. and Matthews S.A.
Projects: SoHO-MDI,GONG

Publication Status: Astrophysical Journal, to be published in the August 2011 issue
Last Modified: 2011-07-12 11:39
Go to main E-Print page  Anatomy of a solar flare: measurements of the December 14, 2006 X-class flare with GONG, Hinode and RHESSI  Quasi periodic oscillations of solar active regions in connection with their flare activity - NoRH observations  Edit Entry  Download Preprint  Delete Entry 

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