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- W1983109112 abstract "Upward travelling small amplitude acoustic waves in an isothermal atmosphere will be reflected downward if the gas is viscous or thermally conducting. The presence of small viscosity creates a layer which acts like an absorbing and reflecting barrier for waves generated below it. Above it the motion decays while below it the effect of viscosity is negligible. In the case of thermal conduction the effect is different since the oscillatory motion in the upper region approaches an isothermal one because of the exponential increase with height of the thermal diffusivity. Thus the local sound speed in the upper region approaches the Newtonian sound speed, and the difference in the speed in the two regions results in partial reflection and transmission. The addition of Newtonian cooling affects mainly the lower region, in which it produces wave attenuation and alters the wave length. If the Newtonian cooling is large, the temperature in the lower region evens out and the wave motion in the lower region approaches an isothermal one. This eliminates the attenuation since the isothermal regime is dissipationless. The effect on wave reflection is most pronounced when large Newtonian cooling is combined with thermal conduction. In this case the motion approaches an isothermal one in both regions, as a consequence of which the reflection is eliminated altogether. The case of a horizontal magnetic field is also considered since its effect can be easily combined with that of viscosity." @default.
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- W1983109112 date "1989-09-01" @default.
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- W1983109112 title "The effect of newtonian cooling on the reflection of vertically propagating acoustic waves in an isothermal atmosphere" @default.
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- W1983109112 doi "https://doi.org/10.1016/0165-2125(89)90016-4" @default.
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