Computer Science – Sound
Scientific paper
Nov 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984esasp.220..253c&link_type=abstract
In ESA The Hydromagnetics of the Sun p 253-255 (SEE N85-25091 14-92)
Computer Science
Sound
Atmospheric Stratification, Magnetohydrodynamic Waves, Solar Atmosphere, Sound Waves, Electrical Resistance, Gravity Waves, Solar Magnetic Field, Viscosity
Scientific paper
Acoustic and Alfven gravity waves in a compressible atmosphere, in the presence of a magnetic field, with dissipation respectively by fluid viscosity and electrical resistance are studied. It is argued that acoustic gravity waves grow rapidly in the chromosphere, but in the corona their amplitude is limited by the increasing kinematic viscosity, which may alternatively increase the distance traveled until a shock forms. For Alfven-gravity waves, electrical resistance is predominant as a diffusion process in the convection zone, but in the atmosphere it does not significantly affect the waveform, which is determined by the increase of Alfven speed with altitude accelerating the wave. It is shown that the relative amplitude of Alfven gravity waves decreases with altitude, unlike acoustic gravity waves, which grow into a nonlienar regime, and form shocks. Hydrodynamic waves dominate the mass, and hydromagnetic waves the energy, balance in the solar atmosphere.
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