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  • 1
    Electronic Resource
    Electronic Resource
    Magnetohydrodynamics problems in the interstellar medium : The 40th annual meeting of the division of plasma physics of the american physical society (1999)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 6 (1999), S. 1725-1731 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Many defining features of galaxies and their evolution are controlled by their interstellar gas. From 20% to 50% of the interstellar gas in the Milky Way is in molecular clouds, which are also the sites of star formation. Molecular clouds are turbulent, and magnetic fields are strong enough that the turbulence is believed to be magnetohydrodynamic in character. Analytical and numerical estimates suggest that the turbulence would be dissipated in less than the lifetime of the cloud if it were not driven. A small fraction of the mass in molecular clouds fails to be supported against self-gravity and collapses to form stars; star formation also is strongly influenced by magnetohydrodynamic effects. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.873431
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  • 2
    Electronic Resource
    Electronic Resource
    Fast reconnection of weak magnetic fields (1998)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 5 (1998), S. 247-251 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Fast magnetic reconnection refers to annihilation or topological rearrangement of magnetic fields on a timescale that is independent (or nearly independent) of the plasma resistivity. The resistivity of astrophysical plasmas is so low that reconnection is of little practical interest unless it is fast. Yet, the theory of fast magnetic reconnection is on uncertain ground, as models must avoid the tendency of magnetic fields to pile up at the reconnection layer, slowing down the flow. In this paper it is shown that these problems can be avoided to some extent if the flow is three dimensional. On the other hand, it is shown that in the limited but important case of incompressible stagnation point flows, every flow will amplify most magnetic fields. Although examples of fast magnetic reconnection abound, a weak, disordered magnetic field embedded in stagnation point flow will in general be amplified, and should eventually modify the flow. These results support recent arguments against the operation of turbulent resistivity in highly conducting fluids. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.872694
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  • 3
    Electronic Resource
    Electronic Resource
    Tilt stability of rotating current rings with resistive conductors (1985)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 28 (1985), S. 2517-2523 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The combined effects of rotation and resistive passive conductors on the stability of a rigid current ring in an external magnetic field are studied. Numerical and approximate analytical solutions to the equations of motion are presented, which show that the ring is always tilt unstable on the resistive decay time scale of the conductors, although rotation and eddy currents may stabilize it over short times. Possible applications of our model include spheromaks which rotate or are encircled by energetic particle rings.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.865260
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  • 4
    Electronic Resource
    Electronic Resource
    Spinning a tangled web (1991)
    [s.l.] : Nature Publishing Group
    Nature 352 (1991), S. 755-756 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SPIRAL galaxies, including our own Milky Way galaxy, are permeated by magnetic fields which significantly affect the dynamics and energy balance of the interstellar medium. The fields' influ-ence is important both in small-scale processes such as star formation and in the global equilibrium of the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/352755a0
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  • 5
    Electronic Resource
    Electronic Resource
    Astronomy Magnetic bubbles in space (2002)
    [s.l.] : Nature Publishing Group
    Nature 415 (2002), S. 31-33 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Magnetic fields are found in galaxies and clusters of galaxies throughout the Universe. There is even some evidence for magnetized plasma (ionized gases) bridging the space between two galaxy clusters. But the origin of these magnetic fields and their influence on the intergalactic environment ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/415031a
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  • 6
    Electronic Resource
    Electronic Resource
    Thermal stability of a corona heated by fast mode waves (1980)
    Springer
    Solar physics 66 (1980), S. 305-322 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract It has been proposed that dissipation of hydromagnetic waves is an important heat source for the solar corona. We consider damping by collisionless processes and by electron thermal conduction and ion viscosity, and calculate the wave energy density such that heating balances the energy radiated by the plasma. We then analyze the thermal stability of the wave heated medium. The fastest growing instabilities are condensations perpendicular to the fieldlines. The instability may be important for producing coronal fine structure, and in loops and streamers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00150587
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  • 7
    Electronic Resource
    Electronic Resource
    Going with the flow? (1996)
    [s.l.] : Nature Publishing Group
    Nature 379 (1996), S. 20-21 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] MAGNETIC fields appear to be ubiquitous in the interstellar gas in disk galaxies. These fields have important effects on the dynamics and energy balance of the gas, as well as on star formation, and theory predicts that their morphology should reflect the structure of the ambient medium. However, ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/379020a0
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  • 8
    Electronic Resource
    Electronic Resource
    The tangled web of magnetism (1993)
    [s.l.] : Nature Publishing Group
    Nature 362 (1993), S. 591-592 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] MAGNETIC fields pervade all galaxies, but their origin is a puzzle. From observations of the synchrotron radiation put out by relativistic electrons spiralling through the fields in galaxies characterized by vigorous star formation, Chi and Wolf-endale argue on page 610 ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/362591a0
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  • 9
    Electronic Resource
    Electronic Resource
    Slow and steady spirals (1996)
    [s.l.] : Nature Publishing Group
    Nature 383 (1996), S. 758-759 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SPIRAL nebulae were detected in the eighteenth century, long before it became clear that they were distant galaxies. The magnetic spiral arms reported in this journal in January1 are much subtler features, but their nature may already have been deduced. On page 800 of this issue2, Fan and Lou ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/383758a0
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  • 10
    Electronic Resource
    Electronic Resource
    Magnetic fields in galaxies and beyond (1997)
    [s.l.] : Nature Publishing Group
    Nature 385 (1997), S. 131-136 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Astronomical magnetic fields are generally strong enough to influence the dynamics of gas in present-day galaxies, and may have played an important role in the formation and early evolution of galaxies. Yet the origin of these magnetic fields remains controversial, and observational tests that ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/385131a0
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