Volume 370, Number 3, May II 2001
|Page(s)||1088 - 1091|
|Section||Planets and planetary systems|
|Published online||15 May 2001|
Acoustic waves in a stratified atmosphere
III. Temperature inhomogeneities
Osservatorio Astronomico di Torino, Strada dell'Osservatorio 20, 10025 Pino Torinese, Italy e-mail: email@example.com
2 Harvard-Smithsonian Center for Astrophysics, Cambridge, Massachusetts 02138, USA e-mail: firstname.lastname@example.org
3 Dipartimento di Fisica Generale dell'Università, Via Pietro Giuria 1, 10125 Torino, Italy e-mail: email@example.com
Corresponding author: G. Bodo, firstname.lastname@example.org
Accepted: 15 February 2001
In a gravitationally stratified atmosphere, small temperature variations distort the paths of acoustic waves from the rectilinear paths in an isothermal atmosphere. For temperature increasing upward, low-frequency waves near the acoustic cutoff frequency propagating at a given polar angle are refracted towards the vertical direction (focused) and high-frequency waves, away from the vertical (defocused). Similarly, for temperature increasing towards the axis of a vertical cylinder, low-frequency waves are focused and high-frequency waves are defocused. This effect of temperature inhomogeneities may be important for wave propagation in the chromospheric K2v bright point phenomenon.
Key words: hydrodynamics / Sun: chromosphere / waves
© ESO, 2001
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