Numerical simulations of kink instability in line-tied coronal Loops

CL Gerrard, TD Arber, Alan William Hood, RAM Van der Linden

Research output: Contribution to journalArticlepeer-review

38 Citations (Scopus)

Abstract

The results from numerical simulations carried out using a new shock-capturing, Lagrangian-remap, 3D MHD code, Lare3d are presented. We study the evolution of the m = 1 kink mode instability in a photospherically line-tied coronal loop that has no net axial current. During the non-linear evolution of the kink instability, large current concentrations develop in the neighbourhood of the infinite length mode rational surface. We investigate whether this strong current saturates at a finite value or whether scaling indicates current sheet formation. In particular, we consider the effect of the shear, defined by r phi'/phi where phi = LBtheta/rB(z) is the fieldline twist of the loop, on the current concentration. We also include a non-uniform resistivity in the simulations and observe the amount of free magnetic energy released by magnetic reconnection.

Original languageEnglish
Pages (from-to)1089-1098
Number of pages10
JournalAstronomy & Astrophysics
Volume373
DOIs
Publication statusPublished - Jul 2001

Keywords

  • MHD
  • Sun
  • IDEAL CURRENT LAYERS
  • RECONNECTION
  • STABILITY
  • FLOWS

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