Nonlinear development of the kink instability in coronal flux tubes

Abstract

view Abstract Citations (35) References (17) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Nonlinear Development of the Kink Instability in Coronal Flux Tubes Craig, I. J. D. ; Sneyd, A. D. Abstract This paper describes a Lagrangian numerical scheme for simulating nonlinear evolution of ideal MHD equilibria and applies it to an unstable finite Gold-Hoyle flux tube, line-tied to perfectly conducting endplates. The ensuing kink instability develops considerably faster than linear theory would predict, and eventually (over typically 100 Alfven time scales) a new kinked equilibrium is attained in which current sheets appear to be present. Little magnetic energy is lost in the ideal MHD phase, but resistive instabilities in the current sheets could lead to much more explosive energy release. Numerical studies of nonlinear interactions indicate that growth of the unstable kink mode is suppressed by the presence of other modes, which offers a possible explanation of the observed longevity of coronal loops. Publication: The Astrophysical Journal Pub Date: July 1990 DOI: 10.1086/168954 Bibcode: 1990ApJ...357..653C Keywords: Magnetic Energy Storage; Magnetohydrodynamic Stability; Solar Corona; Solar Flares; Solar Magnetic Field; Solar Prominences; Computerized Simulation; Coronal Loops; Magnetic Field Reconnection; Magnetic Flux; Solar Physics; HYDROMAGNETICS; INSTABILITIES; SUN: CORONA; SUN: FLARES full text sources ADS | Related Materials (1) Erratum: 1991ApJ...371..443C