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  • 11
    Electronic Resource
    Electronic Resource
    Natural selection in the corona (1993)
    [s.l.] : Nature Publishing Group
    Nature 361 (1993), S. 683-684 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] "HEAT always passes from the hotter to the cooler" according to the old song1 - so why is the Sun's corona hotter, by several million degrees, than the underlying Sun, where all the energy is gen-erated? Jack Scudder has a new suggestion2. Where others have sought to put extra energy into the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/361683a0
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  • 12
    Electronic Resource
    Electronic Resource
    The cause of Forbush's 20-year wave (1977)
    [s.l.] : Nature Publishing Group
    Nature 265 (1977), S. 664-664 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] LEVY1 (has suggested an explanation of Forbush's2 20-yr wave in the galactic cosmic-ray diurnal anisotropy. Levy states he knows of no other way to account for the variation. This note discusses a previously known alternative mechanism and provides ,a calculation for the thickness of the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/265664a0
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  • 13
    Electronic Resource
    Electronic Resource
    Coronal Structure at the Solar Eclipse of September 22, 1968 (1969)
    [s.l.] : Nature Publishing Group
    Nature 222 (1969), S. 652-653 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The prediction and observation seem to have several features in common. Fig. la is the sketch of the eclipse of September 22, 1968, and Fig. 16 is the prediction of the coronal structure prepared on September 20, 1968. No prediction near the poles was made because observations of the photospheric ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/222652a0
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  • 14
    Electronic Resource
    Electronic Resource
    The Sun's disturbing behaviour (1990)
    [s.l.] : Nature Publishing Group
    Nature 345 (1990), S. 578-579 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/345578a0
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  • 15
    Electronic Resource
    Electronic Resource
    Why the Sun may appear oblate (1975)
    Springer
    Astrophysics and space science 34 (1975), S. 467-480 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract If the Sun loses angular momentum from its core, due to core contraction, into the solar wind at the observed rate, then an ∼0.7 day rotational period for the core of the Sun is required for temporal equilibrium. The rotational power released in the core contraction process can equal the observed magnetic energy released in the solar activity cycle if the Sun's core rotates with a period near 1.4 to 4 days. The rotational power released from a rotating object is τΩ, where τ is the torque on the object and Ω is its angular velocity. Fitting this to the solar wind torque and core rotation rate provides an 0.5 to 5 day rotation period for the Sun's core. A gravitational Pannekoek-Rosseland electric field in the Sun makes the Ferraro theorem inapplicable in such a way that rather than a constant angular velocity with radius, an inverse square radial dependence occurs. This results in a two day rotational period for the region in the Sun where most of the angular momentum resides. The consistency of the above four methods suggests that the Sun's observed oblateness is due to a rapidly rotating solar core. The oblateness of the photosphere is estimated to be near 3.4×10−5.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00644813
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  • 16
    Electronic Resource
    Electronic Resource
    Electromagnetic-gravitational energy systems (1981)
    Springer
    General relativity and gravitation 13 (1981), S. 561-567 
    Details
    ISSN: 1572-9532
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Two methods axe considered to “tap” the earths' rotational energy. This ancient “collapsed gravitational energy” exceeds the earth-lunar binding energy. One involves an orbiting “electromagnetic-gravitational” coupling system whereby the earth's rotation, with its nonuniform mass distribution, first uses gravity to add orbital energy to a satellite, similar to a planetary “flyby.rd The second stage involves enhanced satellite “drag” as current-carrying coils withdraw the added orbital energy as they pass through the earth's nonuniform magnetic field. A second more direct method couples the earth's rotational motion using conducting wires moving through the noncorotating part (ionospheric current systems) of the geomagnetic field. These methods, although not immediately feasible, are considerably more efficient than using pure gravitational coupling to earth-moon tides.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00757242
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  • 17
    Electronic Resource
    Electronic Resource
    Solar polar spin-down (1973)
    Springer
    Solar physics 32 (1973), S. 315-336 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract An explanation for the solar differential rotation is proposed that makes use of angular momentum transfer in the solar wind and corona. Evidence suggests that for most of the solar cycle, the solar wind is connected by magnetic field lines to high heliographic latitudes on the Sun. Thus the angular momentum lost to the solar wind would present a preferential ‘drag’ to the photospheric material at high heliographic latitudes. It is shown that this drag is sufficient to offset the restoring forces of the Sun's subsurface magnetic field. In fact, the subsurface magnetic field and differential rotation are thought to grow until the stresses are sufficient to balance the torque induced by the solar wind. The present level of differential rotation and solar activity may be maintained by an intricate feedback mechanism involving the whole solar activity cycle. A power calculation based upon this model suggests the Sun's core rotates with a period of between 0.5 and 5 days. Furthermore, this view requires a major change in present theory of solar magnetic field generation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00154945
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  • 18
    Electronic Resource
    Electronic Resource
    Reply to Gilman concerning ‘solar polar spin-down’ (1974)
    Springer
    Solar physics 37 (1974), S. 487-490 
    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/BF00152507
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  • 19
    Electronic Resource
    Electronic Resource
    A model of interplanetary and coronal magnetic fields (1969)
    Springer
    Solar physics 6 (1969), S. 442-455 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A model of the large-scale magnetic field structure above the photosphere uses a Green's function solution to Maxwell's equations. Sources for the magnetic field are related to the observed photospheric field and to the field computed at a ‘source’ surface about 0.6 R ⊙ above the photosphere. The large-scale interplanetary magnetic field sector pattern is related to the field pattern at this ‘source’ surface. The model generates magnetic field patterns on the ‘source’ surface that compare well with interplanetary observations. Comparisons are shown with observations of the interplanetary magnetic field obtained by the IMP-3 satellite.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00146478
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  • 20
    Electronic Resource
    Electronic Resource
    Comment on coronal magnetic field models (1979)
    Springer
    Solar physics 63 (1979), S. 275-277 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A long-standing misconception about the mathematical validity of utilizing Green's function solutions to coronal magnetic fields is discussed. Although this type of solution does not fit the observed line-of-sight component of the photospheric magnetic field, but rather the net flux in a region, the solution does obey Laplace's equation in the inner corona.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00174534
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