Acoustic waves in a stratified atmosphere. III. Temperature inhomogeneities

Details Acoustic waves in a stratified atmosphere. III. Temperature inhomogeneities Acoustic waves in a stratified atmosphere. III. Temperature inhomogeneities

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001a%26a...370.1088b&link_type=abstract

Astronomy and Astrophysics, v.370, p.1088-1091 (2001)

Astronomy and Astrophysics

Astrophysics

4

Hydrodynamics, Sun: Chromosphere, Waves

Scientific paper

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.

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