SUNQUAKE GENERATION by CORONAL MAGNETIC RESTRUCTURING

A. J.B. Russell, M. K. Mooney, J. E. Leake, H. S. Hudson

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

Sunquakes are the surface signatures of acoustic waves in the Sun's interior that are produced by some but not all flares and coronal mass ejections (CMEs). This paper explores a mechanism for sunquake generation by the changes in magnetic field that occur during flares and CMEs, using MHD simulations with a semiempirical FAL-C atmosphere to demonstrate the generation of acoustic waves in the interior in response to changing magnetic tilt in the corona. We find that Alfvén-sound resonance combined with the ponderomotive force produces acoustic waves in the interior with sufficient energy to match sunquake observations when the magnetic field angle changes of the order of 10° in a region where the coronal field strength is a few hundred gauss or more. The most energetic sunquakes are produced when the coronal field is strong, while the variation of magnetic field strength with height and the timescale of the change in tilt are of secondary importance.

Original languageEnglish
Article number42
JournalAstrophysical Journal
Volume831
Issue number1
DOIs
Publication statusPublished - 1 Nov 2016

Keywords

  • magnetohydrodynamics (MHD)
  • Sun: atmosphere
  • Sun: coronal mass ejections (CMEs)
  • Sun: flares
  • Sun: helioseismology
  • Sun: magnetic fields

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