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  • 1990-1994  (6)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Nonaxisymmetric magnetogravitational instability of a streaming fluid cylinder ambient with a tenuous medium pervaded by transverse varying fields (1992)
    Springer
    Astrophysics and space science 187 (1992), S. 241-260 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The stability of a self-gravitating streaming fluid cylinder acting upon the electromagnetic force ambient with a tenuous medium of negligible inertia but pervaded by a transverse varying fields, has been developed. The stability criterion is derived, discussed analytically and the results are verified numerically. The cylinder is purely self-gravitating unstable in small axisymmetric domain and stable in all the rest states. modes while the transverse field exterior the cylinder is stabilizing or destabilizing according to restrictions in the asymmetric modes and purely destabilizing in the symmetric one. The streaming has a strong destabilizing influence and that influence is independent of the kind of the perturbation and wavelengths. Both the streaming and the electromagnetic influences increase the gravitational axisymmetric unstable domain and shrink those of stability in the axisymmetric and non-axisymmetric perturbations. Moreover, the stabilizing character of the Lorentz force of some states, is physicaly interpreted, will not be able to suppress the gravitational instability because the gravitational instability of sufficiently long waves will persist.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00643393
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Stability of a compressible fluid cylinder ambient with a bounded conducting medium under general varying magnetic fields (1990)
    Springer
    Astrophysics and space science 172 (1990), S. 305-314 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The stability of a compressible fluid cylinder pervaded by a longitudinal uniform magnetic field-ambient with a bounded conducting medium of negligible inertia penetrated with general varying vacuum magnetic fields has been developed. The stability criterion describing the stability characteristics of that model is derived and discussed analytically in general terms. The axial fields have always stabilizing influences. The azimuthal vacuum field has a destabilizing effect, however, it becomes minimal if the perturbed and the unperturbed vacuum fields are not orthogonal. The magnetodynamic instability of the fluid jet is modified in the presence of the fluid compressibility. The stabilizing influence due to the latter may be realized more clearly on utilizing the numerical methods for investigating the eigenvalue relation. Several reported works can be recovered as limiting cases with appropriate simplifications.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00643323
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Magnetogravitodynamic instability of a cylindrical fluid jet acting upon a general, varying magnetic field (1991)
    Springer
    Astrophysics and space science 182 (1991), S. 85-96 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The instability of a fluid cylinder under the action of self-gravitating, inertia, and electromagnetic forces is developed. A general eigenvalue relation is derived studied analytically and the results are confirmed numerically. The jet is gravitationally unstable for small axisymmetric disturbances and stable for all other disturbances. The electromagnetic force has stabilizing and destabilizing influences not only in the axisymmetric mode but also in the non-axisymmetric disturbances. This is due to the fact that the pervading magnetic field is non-uniform. The vacuum field attains its maximum destabilizing influence if the perturbed and unperturbed vacuum fields are orthogonal whether the disturbance is axisymmetric or not. The Lorentz force for some states has the character of enlarging the gravitational unstable domain and decreasing the stable regions in all possible modes of perturbations. In other states the Lorentz force is totally stabilizing but no magnetic field, however strong, can suppress the gravitational instability because the gravitational instability of sufficiently long waves will persist.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00646444
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    A note on MHD instability of a compressible gravitational streaming fluid cylinder (1992)
    Springer
    Astrophysics and space science 191 (1992), S. 307-312 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The fundamental equations are formulated using cylindrical polar coordinates and then solved in the unperturbed state. The perturbation equations are determined, simplified, integrated and the constants of integrations are identified by applying appropriate boundary conditions across the perturbed fluid interface. A cumbersome stability criterion for MHD inviscid compressible self-gravitating streaming fluid cylinder is derived. The magnetic field is stabilizing, the streaming is destabilizing while both of the self-gravitating and compressibility are stabilizing or not according to restrictions and that the gravitational instability of sufficiently long waves will persist. Several approximations are required to obtain Chandrasekhar's and Fermi's dispersion relation (Chandrasekhar and Fermi, 1953).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00644778
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Magnetodynamic stability of a fluid cylinder under the lundquist force-free magnetic field (1990)
    Springer
    Astrophysics and space science 166 (1990), S. 183-192 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The magnetodynamic (in)stability of a conducting fluid cylinder subject to the capillarity and electromagnetic forces has been developed. The cylinder is pervaded by a uniform magnetic field but embedded in the Lundquist force-free varying field that allows for flowing a current surrounding the fluid. A general eigenvalue relation is derived based on a study of the equilibrium and perturbed states. The stability criterion is discussed analytically in general terms. The surface tension is destabilizing for small axisymmetric mode and stable for all others. The principle of the exchange of stability is allowed for the present problem due to the non-uniform behaviour of the force-free field. Each of the axial and transverse force-free fields separately exerts a stabilizing influence in the most dangerous mode but the combined contribution of them is strongly destabilizing. Whether the model is acted upon the electromagnetic force (with the Lundquist field) the stability restrictions or/and the capillarity force are identified. Several reported works can be recovered as limiting cases with appropriate simplifications.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01094891
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Magnetohydrodynamic oscillation of a gas jet of zero inertia dispersed in a resistive liquid with energy conservation (1992)
    Springer
    Astrophysics and space science 187 (1992), S. 9-25 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The dynamical oscillation and instability of a gas cylinder of zero inertia immersed in a resistive liquid has been developed for symmetric perturbations. In the absence of the magnetic field we have used the conservation of energy to study such problem for all symmetric and asymmetric perturbations. In the latter it is found that the temporal amplification is much lower than that of the full fluid jet. The model is capillary stable for all short and long wavelengths in the asymmetric perturbation while in the symmetric disturbances it is stabilizing or not according the perturbed wavelength is shorter than the gas cylinder circumference or not. The resistivity is stabilizing or destabilizing according to restrictions. The electromagnetic body force is stabilizing for all wavelengths in the rotationally-symmetric disturbances. The Lorentz body force, for high magnetic field intensity, could be suppressing the destabilizing character of the present model. This may be due to the fact that the acting magnetic field is uniform and that the fluid is considered to be incompressible.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00642684
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    Paper (German National Licenses)
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