199 research outputs found
Total resonant absorption of acoustic-oscillations in sunspots
No full textThe question of total resonant absorption of acoustic oscillations in sunspots is studied for cylindrical 1-D flux tubes that are stratified only in the radial direction and surrounded by a uniform, non-magnetic plasma. The numerical investigation of Goossens and Poedts (1992) in linear resistive MHD is taken further by increasing the strength of the azimuthal magnetic field in the equilibrium flux tubes. For relatively strong azimuthal magnetic fields, total absorption is found over a relatively wide range of spot radii.status: Publishe
The continuous-spectrum of mhd waves in 2-d solar loops and arcades - parametric study of poloidal mode-coupling for poloidal magnetic-fields
No full textstatus: Publishe
Poloidal Mode Coupling of Alfven and Slow Continuum Modes in 2D Coronal Loops
No full textstatus: Publishe
The continuous-spectrum of mhd waves in 2d solar loops and arcades - 1st results on poloidal mode-coupling for poloidal magnetic-fields
No full textA first attempt is made to study the continuous spectrum of linear ideal MHD for 2D solar loops and to understand how 2D effects change the continuum eigenfrequencies and continuum eigenfunctions. The continuous spectrum is computed for 2D solar loops with purely poloidal magnetic fields and it is investigated how non-circularity of the cross-sections of the poloidal magnetic surfaces and variations of density along the poloidal magnetic field lines change the continuous spectrum and induce poloidal wave number coupling in the eigenfunctions. Approximate analytical results and numerical results are obtained for the eigenfrequencies and the eigenfunctions and the poloidal wave number coupling is clearly illustrated. It is found that the continuum frequencies are substantially increased, that the ranges of the continuum frequencies are considerably enlarged and that the derivatives of the continuum frequencies normal to the magnetic surfaces are substantially increased. The eigenfunctions are strongly influenced by poloidal wave number coupling. Implications of these findings for the heating mechanisms of resonant absorption and phase mixing are briefly considered. © 1987 D. Reidel Publishing Company.status: Publishe
Destruction and reformation of intermediate shock segments in 3D MHD bow shock flows
No full textstatus: Publishe
R.S. Peters' Comprehensive Theory of Moral Education
No full textThis article presents R.S. Peters’ theory of moral education embedded in his broad conception of morality. The author examines Peters’ views against the background of Kohlberg’s stage theory of moral development; hence, the positions of both thinkers are interwoven throughout the discussion. It addresses some central issues relevant to moral education such as, for example: cognitive and affective aspects of morality, and the acquisition of virtues. In the article the author argues that Peters’ account of moral development and moral education provides supplementation for the somewhat narrow theory developed by Kohlberg, thus establishing a broader framework relevant to moral education.status: Publishe
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