On the continua in two-dimensional nonadiabatic magnetohydrodynamic spectra
| Autor: | A. J. C. Beliën, R. A. M. Van der Linden, A. De Ploey |
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| Rok vydání: | 2000 |
| Předmět: |
Physics
Curvilinear coordinates Continuum (measurement) Continuous spectrum Plasma Condensed Matter Physics Spectral line Classical mechanics Physics::Plasma Physics Normal mode Quantum electrodynamics Physics::Space Physics Astrophysics::Solar and Stellar Astrophysics Magnetohydrodynamic drive Magnetohydrodynamics |
| Zdroj: | Physics of Plasmas, 7, 2354-2365 |
| ISSN: | 1089-7674 1070-664X 2354-2365 |
| DOI: | 10.1063/1.874072 |
| Popis: | The equations for the continuous subspectra of the linear magnetohydrodynamic (MHD) normal modes spectrum of two-dimensional (2D) plasmas are derived in general curvilinear coordinates, taking nonadiabatic effects in the energy equation into account. Previously published derivations of continuous spectra in the 2D ideal MHD case and in 1D nonadiabatic MHD are thus complemented with calculations for 2D nonadiabatic MHD spectra. The nonadiabatic MHD spectrum contains a thermal continuum in addition to the well-known Alfven and slow continua. These thermal continuum modes are exponentially decaying or growing in time. The latter unstable modes are widely accepted as an explanation for the onset of marfes in tokamaks and the most favored hypothesis for prominence formation in the solar corona. A numerical code has been developed to calculate the continuum modes. An investigation of a typical 'pre-MARFE' (multifaceted asymmetric vadiation from the edge) equilibrium is presented. (C) 2000 American Institute of Physics. [S1070-664X(00)03604-1]. |
| Databáze: | OpenAIRE |
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