Computer Science – Sound
Scientific paper
Nov 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...291..310z&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 291, no. 1, p. 310-319
Computer Science
Sound
27
Acoustic Propagation, Astronomical Models, Boundary Layers, Helioseismology, Solar Convection (Astronomy), Solar Cycles, Solar Granulation, Solar Interior, Sound Waves, Flux Density, Magnetic Fields, Perturbation, Phase Velocity
Scientific paper
A simple two-stream model of alternating hot and cool vertical layers, with uniform upwards and downwards velocities, respectively, was studied to investigate the influence of convection on solar global oscillations. The effect on vertically propagating acoustic waves is small at low frequency, but leads to a significant decrease of the mean phase velocity of high-frequency modes which are more confined to the cool layers. As our main result we thus find frequency corrections for solar p modes of low degree and high order which may reconcile the calculated with the observed eignefrequencies. Our model also yield high-frequency modes with more or less horizontal propagation representing the distortion of the wave fronts due to the horizontal structure, and a 'slow mode', a surface wave propagating along the the boundaries between the layer of different vertical velocity.
Stix Michael
Zhugzhda Yu. D.
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