Computer Science – Sound
Scientific paper
Aug 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993alab.repts....m&link_type=abstract
Annual Report, period ending Aug. 1993 Alabama Univ., Huntsville, AL. Dept. of Mechanical and Aerospace Engineering.
Computer Science
Sound
Atmospheric Stratification, Chromosphere, Convection, Dissipation, Energy Spectra, Far Fields, Heating, Magnetic Flux, Magnetohydrodynamic Waves, Solar Atmosphere, Sound Waves, Sun, Turbulence, Wave Generation, Wave Propagation, Coronal Holes, Solar Wind, Stellar Atmospheres
Scientific paper
This paper presents work performed on the generation and physics of acoustic waves in the solar atmosphere. The investigators have incorporated spatial and temporal turbulent energy spectra in a newly corrected version of the Lighthill-Stein theory of acoustic wave generation in order to calculate the acoustic wave energy fluxes generated in the solar convective zone. The investigators have also revised and improved the treatment of the generation of magnetic flux tube waves, which can carry energy along the tubes far away from the region of their origin, and have calculated the tube energy fluxes for the sun. They also examine the transfer of the wave energy originated in the solar convective zone to the outer atmospheric layers through computation of wave propagation and dissipation in highly nonhomogeneous solar atmosphere. These waves may efficiently heat the solar atmosphere and the heating will be especially significant in the chromospheric network. It is also shown that the role played by Alfven waves in solar wind acceleration and coronal hole heating is dominant. The second part of the project concerned investigation of wave propagation in highly inhomogeneous stellar atmospheres using an approach based on an analytic tool developed by Musielak, Fontenla, and Moore. In addition, a new technique based on Dirac equations has been developed to investigate coupling between different MHD waves propagating in stratified stellar atmospheres.
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