Overstabilization of acoustic modes in a polytropic atmosphere

Solar Physics ◽  
1978 ◽  
Vol 56 (2) ◽  
Author(s):  
H.M. Antia ◽  
S.M. Chitre ◽  
D.M. Kale
Keyword(s):  
Acoustic Modes ◽  
Polytropic Atmosphere

scholarly journals Instabilities in a Polytropic Atmosphere

1980 ◽  
Vol 51 ◽  
pp. 15-15
Author(s):  
H.M. Antia ◽  
S.M. Chitre
Keyword(s):  
Thermal Conductivity ◽  
Perturbation Theory ◽  
Compressible Fluid ◽  
Fluid Layer ◽  
Acoustic Modes ◽  
Stellar Convection ◽  
Self Consistent ◽  
Linearized Theory ◽  
Thermally Conducting ◽  
Polytropic Atmosphere

AbstractThe density in the outer layers of stars varies by several orders of magnitude and it is desirable to include the full effects of compressibility in any study of instabilities arising in stellar convection zones. In an unstable compressible fluid-layer that is thermally conducting both the oscillatory and non-oscillatory motions can simultaneously arise. The conditions under which the oscillatory acoustic modes can be overstabilized in a polytropic atmosphere are examined. It is argued that the linearized perturbation theory breaks down when applied to an inviscid complete polytrope which has vanishing density and temperature at the top for both optically-thin and optically-thick approximations. However, the linearized theory is demonstrated to be self-consistent when viscosity and thermal conductivity are included in the study of complete polytropes.

On a Nonlinear Dispersion Effect of Geodesic Acoustic Modes

2013 ◽  
Vol 8 (0) ◽  
pp. 1403010-1403010 ◽  
Author(s):  
Makoto SASAKI ◽  
Kimitaka ITOH ◽  
Naohiro KASUYA ◽  
Klaus HALLATSCHEK ◽  
Sanae-I. ITOH
Keyword(s):  
Nonlinear Dispersion ◽  
Dispersion Effect ◽  
Acoustic Modes

Acoustic Modes of Multi-Ion Dusty Plasmas

2020 ◽  
Vol 76 (9) ◽  
pp. 824-828
Author(s):  
N. Ahmad ◽  
Majeed Ur Rehman ◽  
M. N. S. Qureshi ◽  
Y. Al-Hadeethi ◽  
A. A. Abid ◽  
...  
Keyword(s):  
Dusty Plasmas ◽  
Acoustic Modes

Propagation of dust electro-acoustic modes in dusty plasma

2001 ◽  
Vol 8 (9) ◽  
pp. 3897-3901 ◽  
Author(s):  
K. Avinash
Keyword(s):  
Dusty Plasma ◽  
Acoustic Modes

Radial acceleration of geodesic acoustic modes in the presence of a temperature gradient

2017 ◽  
Vol 24 (7) ◽  
pp. 072503 ◽  
Author(s):  
F. Palermo ◽  
E. Poli ◽  
A. Bottino ◽  
A. Biancalani ◽  
G. D. Conway ◽  
...  
Keyword(s):  
Temperature Gradient ◽  
Radial Acceleration ◽  
Acoustic Modes
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