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  • 1
    Electronic Resource
    Electronic Resource
    Comment on "Bifurcations from periodic solution in a simplified model of two-dimensional magnetoconvection,'' by N. Bekki and T. Karakisawa [Phys. Plasmas 2, 2945 (1995)] (1996)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 3 (1996), S. 2475-2476 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In a recent paper, N. Bekki and T. Karakisawa (Ref. 1) considered two-dimensional Boussinesq convection in an imposed vertical magnetic field. We would like to point out that a number of their results and claims are incorrect. These can be seen by comparing their work with ours. (AIP). ©1996 American Institute of Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.871699
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  • 2
    Electronic Resource
    Electronic Resource
    The three-dimensional development of the shearing instability of convection (1996)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 8 (1996), S. 1350-1352 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Two-dimensional convection can become unstable to a mean shear flow. In three dimensions, with periodic boundary conditions in the two horizontal directions, this instability can cause the alignment of convection rolls to alternate between the x and y axes. Rolls with their axes in the y-direction become unstable to a shear flow in the x-direction that tilts and suppresses the rolls, but this flow does not affect rolls whose axes are aligned with it. New rolls, orthogonal to the original rolls, can grow, until they in turn become unstable to a shear flow. This behavior is illustrated through numerical simulations and low-order models, and the sequence of local and global bifurcations is determined. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.868943
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  • 3
    Electronic Resource
    Electronic Resource
    Simple models for magnetic flux tubes (1983)
    Springer
    Solar physics 87 (1983), S. 65-75 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Known potential field solutions can be used to model the structure of magnetic fields in the solar photosphere. Several two-dimensional and axisymmetric solutions are compared. In the most satisfactory model the vertical component of the field is prescribed on a horizontal plane so as to be uniform within a finite disc and zero outside it. The resulting flux distribution provides a good description of small scale intergranular magnetic fields and of the observed field structure in a pore, but is inadequate for sunspots.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00151161
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  • 4
    Electronic Resource
    Electronic Resource
    Book review (1985)
    Springer
    Solar physics 96 (1985), S. 423-423 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00149695
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  • 5
    Electronic Resource
    Electronic Resource
    Differential rotation and magnetic torques in the interior of the Sun (1985)
    [s.l.] : Nature Publishing Group
    Nature 317 (1985), S. 790-792 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The solar angular velocity, O, is a function of radius r and latitude, but rotational splitting of the frequencies of sectoral harmonics is weighted towards the equatorial rotation rate4"6. At the surface (G = #?), ?-2.90 x 106rads1; Duvall et al6 inverted the data showing that, immediately below ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/317790a0
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  • 6
    Electronic Resource
    Electronic Resource
    Magnetic activity and variations in solar luminosity (1980)
    [s.l.] : Nature Publishing Group
    Nature 287 (1980), S. 616-617 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The magnetic field in the solar envelope is believed to be predominantly toroidal and generated by differential rotation11'12. Flux expulsion and magnetic buoyancy11'12 will quickly sweep toroidal fields from the convective zone. Moreover, the observed large scales of coronal holes and complexes of ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/287616a0
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  • 7
    Electronic Resource
    Electronic Resource
    Formation of intense magnetic fields near the surface of the Sun (1977)
    [s.l.] : Nature Publishing Group
    Nature 266 (1977), S. 686-689 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Convection concentrates magnetic flux into ropes between granules in the solar photosphere, with average fields of up to 1500 G. The magnetic energy density is locally much greater than the kinetic energy density. Theoretical limits to the amplification of magnetic fields by convection are analysed ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/266686a0
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  • 8
    Electronic Resource
    Electronic Resource
    Period doubling and chaos in partial differential equations for thermosolutal convection (1983)
    [s.l.] : Nature Publishing Group
    Nature 303 (1983), S. 663-667 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Numerical experiments on two-dimensional thermosolutal convection reveal a transition from periodic oscillations to chaos through a sequence of period-doubling bifurcations. Within the chaotic region there are narrow periodic windows. This is the first example of period-doubling in solutions of ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/303663a0
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  • 9
    Electronic Resource
    Electronic Resource
    On the magnetic field in pores (1970)
    Springer
    Solar physics 13 (1970), S. 85-103 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The magnetic field in an axisymmetric pore is current free and can be represented by a flux tube with a magnetic potential of the formAJ 0(kr)e -kz. For a given magnetic flux the field in this pore model is uniquely defined if the magnetic pressure balances the gas pressure at two levels. For models with fluxes of 0.5–3.0 × 1020 mx the surface radius varies from 1100–2700 km (diameters of 3–8 arc-sec) and the Wilson depression is estimated at 200 km. As the flux increases, the field becomes nearly horizontal at the edge of the pore and eventually a penumbra is formed. The distinction between pores and sunspots is investigated; the critical flux is about 1020 Mx, corresponding to a radius of 1500 km.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00963944
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  • 10
    Electronic Resource
    Electronic Resource
    Chaotic behavior in stellar dynamos (1985)
    Springer
    Journal of statistical physics 39 (1985), S. 477-491 
    Details
    ISSN: 1572-9613
    Keywords: Solar activity ; magnetic cycles ; dynamos ; chaos
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Slowly rotating main-sequence stars with deep convective zones have activity cycles like the sun's. The solar cycle is aperiodic and modulated to give intervals of reduced activity. A simple sixth-order system, obtained by truncating the dynamo equations, has solutions that mimic this behavior. The transition to chaos is analyzed and the astrophysical significance of these results is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01008346
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