Acoustic waves in a stratified atmosphere. III. Temperature inhomogeneities
Abstract
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.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- May 2001
- DOI:
- 10.1051/0004-6361:20010278
- Bibcode:
- 2001A&A...370.1088B
- Keywords:
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- HYDRODYNAMICS;
- SUN: CHROMOSPHERE;
- WAVES