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  • 1970-1974  (3)
  • 1972  (3)
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  • 1970-1974  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    Measurements of the limb darkening in the forbidden Mgi line at 4571.1 Å (1972)
    Springer
    Solar physics 23 (1972), S. 18-25 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We report high resolution measurements of the center-to-limb variation of the Mgi line at 4571.1 Å. This forbidden line is of interest because it should be formed in LTE. Comparison of our measurements with the Harvard-Smithsonian Reference Atmosphere show that the line center radiation originates in the temperature minimum region from 330 to 550 km above the point where τ continuum = 1. Observations near the limb confirm that the temperature minimum is ∼4200K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00153888
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    A first order analysis of variations of the limb darkening and the shapes for solar Fraunhofer lines (1972)
    Springer
    Solar physics 24 (1972), S. 18-27 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract New center-to-limb measurements in FeI lines show changes in both the line profiles and the limb darkening curves that appear to be characteristic of many other solar lines. Here we seek the constraints placed on the atmospheric model by these effects. We find that in addition to a depth varying source function we must also allow the ratio of the continuous absorption coefficient to the total absorption coefficient to pass through a minimum in the mid-photosphere. Such an effect is consistent with inward increases of the Doppler width and damping constant in the upper photosphere and an inward increase of the ionization for both iron and hydrogen in the low photosphere.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00231078
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    The spectra of near-vertical structures on the solar disk (1972)
    Springer
    Solar physics 27 (1972), S. 27-33 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Bright emission arches in the spectra of Hα and the Ca II (H and K lines) are identified as the spectroscopic picture of the chromospheric network as it appears near the solar limb. Analysis of the geometrical properties of these spectroscopic arches indicates that the average network is a diverging sheet with a divergence angle of ∼ 50°. This sheet extends to 2600 km and 2000 km as an opaque emission feature in Hα and the Ca II (H and K) lines, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00151766
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    Paper (German National Licenses)
    Fulltext
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