Emergence of magnetic flux from the convection zone into the solar atmosphere. I - Linear and nonlinear adiabatic evolution of the convective-Parker instability

Abstract

view Abstract Citations (51) References (53) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Emergence of Magnetic Flux from the Convection Zone into the Solar Atmosphere. I. Linear and Nonlinear Adiabatic Evolution of the Convective-Parker Instability Nozawa, S. ; Shibata, K. ; Matsumoto, R. ; Sterling, A. C. ; Tajima, T. ; Uchida, Y. ; Ferrari, A. ; Rosner, R. Abstract The linear and nonlinear properties of the evolution of emerging magnetic flux from the solar convection zone into the photosphere, chromosphere, and corona are studied. A linear stability analysis of the partially magnetized convection zone is presented. The growth rate of this combined convective-Parker instability is found to differ significantly from that of the Parker instability in the absence of convection. When beta(=pg/pm) is greater than 10 in the initial flux sheet, the growth rate increases with horizontal wavenumber, and there is no maximum growth rate. A local maximum can occur when the flux is initially located near the top of the convection zone. When beta is less than 10, the convective-Parker instability behaves like the Parker instability for long-wavelength modes, and like the convective instability for short-wavelength modes. A 2D MHD code is used to study the nonlinear evolution of the system. When the initial flux sheet has beta less than 10, the long-wavelength mode dominates the nonlinear evolution of the system, independently of the initial perturbation wavelength. Publication: The Astrophysical Journal Supplement Series Pub Date: January 1992 DOI: 10.1086/191627 Bibcode: 1992ApJS...78..267N Keywords: Magnetic Flux; Magnetohydrodynamic Stability; Nonlinear Evolution Equations; Photosphere; Solar Atmosphere; Solar Corona; Adiabatic Conditions; Interstellar Matter; Spiral Galaxies; Solar Physics; INSTABILITIES; MAGNETOHYDRODYNAMICS: MHD; SUN: MAGNETIC FIELDS full text sources ADS | data products SIMBAD (2)