Results 291 to 300 of about 176,247 (337)

Stellar mass loss and atmospheric instability

International Astronomical Union Colloquium, 1988
AbstractA review is given of rate of mass-loss values in the upper part of the Hertzsprung-Russell diagram. Near the luminosity limit of stellar existance = −10−4 M⊙ yr−1. Episodical mass loss in bright variable super- and hypergiants does not significantly increase this value. For Wolf-Rayet stars the rate of mass loss is larger by a factor 140 than
Cornelis de Jager, Hans Nieuwenhuijzen
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Convective instability in a compressible atmosphere

Solar Physics, 1973
The degree of convective instability as expressed by the growth rate ω of linear modes, is calculated for a plane parallel polytropic atmosphere in the presence of radiative damping, without using Boussinesq approximation. A comparison with the results based on the Boussinesq approximation reveals that the use of the Boussinesq approximation leads to ...
S. M. Chitre, M. H. Gokhale
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Taylor Instability of an Inverted Atmosphere

The Physics of Fluids, 1960
The stability of an idealized inverted atmosphere is investigated. It is shown that an initial perturbation grows in a manner similar to that found by Taylor for the instability of accelerated fluid surfaces.
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Instability of Frontal Motions in the Atmosphere

Journal of the Atmospheric Sciences, 1972
Abstract Stability properties of a two-layer model of homogeneous and incompressible fluid subject to gravity and rotation are investigated by the small-perturbation method. The upper and lower fluids correspond, respectively, to warm and cold air. The interface between the warm and cold layers intersects the ground and forms the surface front.
Akira Kasahara, Desiraju B. Rao
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Instabilities of atmospheric laser propagation

SPIE Proceedings, 1990
The 'thermal blooming' nonlinearity associated with lasers' atmospheric propagation causes several other propagation instabilities which limit the maximum power transmissible by the atmosphere; these are stimulated thermal Rayleigh scattering, the closed-loop instability, the phase-compensation instability, and, in the case of a repetitively-pulsed ...
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Baroclinic Instability in the Venus Atmosphere

Journal of the Atmospheric Sciences, 1984
A three-dimensional, spherical, primitive equation eigenvalue model is used to investigate the baroclinic stability properties of the wind and temperature fields in the Venus atmosphere as measured by Pioneer Venus. It is found that baroclinic instability occurs in the region of the middle cloud deck. The most unstable modes have growth times less than
Richard E. Young, Howard Houben, Leonhard Pfister   +2 more
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Magnetic Kelvin–Helmholtz instability in the solar atmosphere

New Astronomy, 2013
Abstract Main aim of this paper is to twofold: firstly, to investigate the formation mechanism and secondly to search the effects of fundamental parameters like magnetic field, shear velocity and wave number on the growth rate of the magnetic Kelvin–Helmholtz instability occured in the solar atmosphere.
ÇAVUŞ, HÜSEYİN, KAZKAPAN, Derya
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Impact of Temperature Perturbation on the Atmospheric Instability

2024 IEEE Mediterranean and Middle-East Geoscience and Remote Sensing Symposium (M2GARSS)
Srinivasa Ramanujam Kannan
exaly   +2 more sources

Cathode instability in argon atmospheres

Electrical Engineering, 1956
EXTENSIVE experimental and analytical studies have provided a basic understanding of the manifestation of arc cathode instability relative to fluctuations of arc voltage as influenced by electrical, chemical, and geometrical parameters. These studies have contributed significantly to the development of controlled cathode stabilization systems of the ...
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Combustion Instabilities and Control of a Multiswirl Atmospheric Combustor

Journal of Engineering for Gas Turbines and Power, 2004
Thermoacoustic instability and lean blowout (LBO) are investigated experimentally in an atmospheric swirl-stabilized combustor fueled with gaseous propane. Factors affecting combustion instability are identified. Sinusoidal or steady air forcing of either the swirling air shear layer or the fuel line, with less than 1.0% of combustion air, can reduce ...
Tongxun Yi, Ephraim Gutmark
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