Comparison of seismic signatures of flares obtained by SOHO/Michelson Doppler Imager and GONG instruments

Zharkov, Sergei, Zharkova, Valentina and Matthews, Sarah (2011) Comparison of seismic signatures of flares obtained by SOHO/Michelson Doppler Imager and GONG instruments. The Astrophysical Journal, 739 (2). p. 70. ISSN 0004-637X

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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.

Item Type: Article
Uncontrolled Keywords: methods: data analysis; Sun: flares; Sun: helioseismology; Sun: oscillations
Subjects: F500 Astronomy
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: Becky Skoyles
Date Deposited: 02 Oct 2013 10:59
Last Modified: 12 Oct 2019 19:07

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