A Statistical Correlation of Sunquakes Based on Their Seismic and White-Light Emission

J. C. Buitrago-Casas, J. C. Martínez Oliveros, C. Lindsey, B. Calvo-Mozo, S. Krucker, L. Glesener, S. Zharkov

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

Several mechanisms have been proposed to explain the transient seismic emission, i.e. “sunquakes,” from some solar flares. Some theories associate high-energy electrons and/or white-light emission with sunquakes. High-energy charged particles and their subsequent heating of the photosphere and/or chromosphere could induce acoustic waves in the solar interior. We carried out a correlative study of solar flares with emission in hard X-rays, enhanced continuum emission at 6173 Å, and transient seismic emission. We selected those flares observed by the Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI) with a considerable flux above 50 keV between 1 January 2010 and 26 June 2014. We then used data from the Helioseismic and Magnetic Imager onboard the Solar Dynamic Observatory to search for excess visible-continuum emission and new sunquakes not previously reported. We found a total of 18 sunquakes out of 75 flares investigated. All of the sunquakes were associated with an enhancement of the visible continuum during the flare. Finally, we calculated a coefficient of correlation for a set of dichotomic variables related to these observations. We found a strong correlation between two of the standard helioseismic detection techniques, and between sunquakes and visible-continuum enhancements. We discuss the phenomenological connectivity between these physical quantities and the observational difficulties of detecting seismic signals and excess continuum radiation.

Original languageEnglish (US)
Pages (from-to)3151-3162
Number of pages12
JournalSolar Physics
Volume290
Issue number11
DOIs
StatePublished - Nov 1 2015

Keywords

  • Flares, white-light flares
  • Helioseismology

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