ENERGY RELEASE AND INITIATION OF A SUNQUAKE IN A C-CLASS FLARE

I. N. Sharykin, A. G. Kosovichev, I. V. Zimovets

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

We present an analysis of the C7.0 solar flare from 2013 February 17, revealing a strong helioseismic response (sunquake) caused by a compact impact observed with the Helioseismic and Magnetic Imager on board the Solar Dynamics Observatory (SDO) in the low atmosphere. This is the weakest known C-class flare generating a sunquake event. To investigate the possible mechanisms of this event and understand the role of accelerated charged particles and photospheric electric currents, we use data from three space observatories: RHESSI, SDO, and Geostationary Operational Environmental Satellite. We find that the photospheric flare impact does not spatially correspond to the strongest hard X-ray emission source, but both of these events are parts of the same energy release. Our analysis reveals a close association of the flare energy release with a rapid increase in the electric currents and suggests that the sunquake initiation is unlikely to be caused by the impact of high-energy electrons, but may be associated with rapid current dissipation or a localized impulsive Lorentz force in the lower layers of the solar atmosphere.

Original languageEnglish (US)
Article number102
JournalAstrophysical Journal
Volume807
Issue number1
DOIs
StatePublished - Jul 1 2015

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Keywords

  • Sun: X-rays, gamma rays
  • Sun: chromosphere
  • Sun: flares
  • Sun: helioseismology
  • Sun: magnetic fields

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