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  • Articles: DFG German National Licenses  (5)
  • 1985-1989  (5)
Source
  • Articles: DFG German National Licenses  (5)
Material
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Magnetic field measurements based on the Zeeman splitting of forbidden transitions (1985)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 56 (1985), S. 855-856 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The measurement of the poloidal magnetic field in a tokamak plasma from the Zeeman splitting and polarization of the magnetic dipole radiation from heavy ions is discussed. When viewed from a direction perpendicular to the toroidal field, the effect of the poloidal field on the circularly polarized radiation is detectable using a photoelectric polarimeter.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1138071
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Vortex flow in the solar photosphere (1988)
    [s.l.] : Nature Publishing Group
    Nature 335 (1988), S. 238-240 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The vortex we observed had a diameter of ~ 5,000 km (about three granulation cells), an average circulation of 4,000 km s"1, and a central vorticity of 1,400 s"1. This vorticity is an order of magnitude larger than seen in previous measurements from the Solar Optical Universal Polarimeter (SOUP) ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/335238a0
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Polar observatories (1988)
    [s.l.] : Nature Publishing Group
    Nature 334 (1988), S. 466-466 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SIR-Dreadco's daring projects as described in your journal's weekly column Daedalus have stimulated our imagination. An endeavour that would be of the greatest importance for the astronomical community has occurred to us. In spite of Dreadco's reputation, we do not hesitate to mention it in this ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/334466b0
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Is there a weak mixed polarity background field? Theoretical arguments (1987)
    Springer
    Solar physics 110 (1987), S. 115-128 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A number of processes associated with the formation of active regions produce ‘U-loops’: fluxtubes having two ends at the photosphere but otherwise still embedded in the convection zone. The mass trapped on the field lines of such loops makes them behave in a qualitative different way from the ‘omega-loops’ that form active regions. It is shown that U-loops will disperse though the convection zone and form a weak (down to a few gauss) field that covers a significant fraction of the solar surface. This field is tentatively identified with the inner-network fields observed at Kitt Peak and Big Bear. The process by which these fields escape through the surface is described; a remarkable property is that it can make active regions fields apparently disappear in situ. The mixed polarity moving magnetic features near sunspots are interpreted as a locally intense form of this disappearance by escape of U-loops.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00148207
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    On the feasibility of correlation tracking at moderate resolution (1988)
    Springer
    Solar physics 116 (1988), S. 205-214 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The SOUP experiment demonstrated that photospheric surface flows can be measured by correlation tracking of white-light intensity features at high resolution (November et al., 1987). In order to assess the feasibility of this technique with observations made at lower resolution, we have applied it to the same SOUP data artificially degraded, but still free of seeing distortion. Comparison with the velocity structures inferred from the original data shows generally good agreement when the resolution is better than about 2″. The radial outflow from a sunspot penumbra, however, can only be seen with resolution of better than 1″. With resolution of worse than 2″, the inferred velocity fields rapidly lose coherence, while resolution of better than 1″ yields little improvement. We conclude that apertures as small as 10–14 cm on a space-based platform will be useful for the measurement of large-scale horizontal motions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00157473
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    Paper (German National Licenses)
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