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  • 1980-1984  (4)
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Material
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Additional results for unstable stratified toroidal magnetic fields in stars (1981)
    Springer
    Astrophysics and space science 75 (1981), S. 521-526 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract General conditions for adiabatic instability of weak axisymmetric toroidal magnetic fields are obtained. In particular all fields which haveH ϕ=0 and ∂H ϕ 2 /∂δ〉0 simultaneously are unstable. This includes all fields which exist near to the axis of symmetry and, indeed, any without an infinite current density anywhere. A detailed discussion is given of fields with an angular dependenceH ϕ 2 ∼|P ℓ (cos θ)|. These fields are dynamically unstable with respect to both axisymmetric and non-axisymmetric perturbations for all values of the azimuthal wave number |m|. The maximum growth rates are independent ofm and they are largest for the fields that are defined in the regions closest to the polar axis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00648660
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    The magnetic field surface structure of HD 215441 (1982)
    Springer
    Astrophysics and space science 83 (1982), S. 213-224 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The oblique rotator model with axisymmetric magnetic fields containing a toroidal component is adopted for the description of the magnetic variations observed in Ap stars. The toroidal component is taken as a non-linear function of the stream function of the poloidal component. A scheme is presented for the determination fromH e andH s observations of the parameters that describe the surface distribution of the magnetic field components. This schema is succesfully applied to the magnetic observations of HD 215441, and the existence of different magnetic field surface structures that reproduce equally well the observations has been found. The main characteristics of the different solutions are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00648555
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    σ-stability analysis of hydromagnetic instabilities in stars with toroidal magnetic fields (1980)
    Springer
    Space science reviews 27 (1980), S. 667-672 
    Details
    ISSN: 1572-9672
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract σ-stability analysis is used to investigate the adiabatic stability of a star containing an axisymmetric toroidal magnetic field. Necessary and sufficient conditions for σ-stability are derived. Special attention is devoted to the typical hydromagnetic instabilities that can be introduced by a weak toroidal magnetic field in a star that is stably stratified in the absence of any magnetic field. An expression for the maximum growth rate of instability is derived and the basic properties of the displacement fields associated with the instabilities are indicated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00168366
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    The effect of a magnetic field on stellar pulsations as a singular perturbation problem (1980)
    Springer
    Space science reviews 27 (1980), S. 661-666 
    Details
    ISSN: 1572-9672
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The perturbation problem that describes the effect of a weak magnetic field on stellar adiabatic oscillation is considered. This perturbation problem is singular when the magnetic field does not vanish at the stellar surface, and a regular perturbation scheme fails where the magnetic pressure is comparable to the thermodynamic pressure. The application of the Method of Matched Asymptotic Expansion is used to obtain expressions for the eigenfunctions and the eigenfrequencies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00168365
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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