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  • 1975-1979  (6)
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Material
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    On the presence of SH in the sunspot spectrum (1979)
    Springer
    Solar physics 62 (1979), S. 69-75 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The expected equivalent widths of individual rotational lines of the most intense Q 2 branch of the 0-0 band of the A 2Σ-X2Πi; system of S32H and S34H have been calculated in the umbral spectrum for five disk positions using Zwaan's (1974) sunspot model. Percentage abundance of S34 in the terrestrial case has been considered valid in our calculations. Strong lines of S32H and S34H of the A-X band system should be detectable in the sunspot spectrum. The molecule SH may play a possible role as a major opacity source in the ultraviolet spectrum of sunspots along with the molecule OH in the upper layers (up to τ 0.5μm = 1.0) wherefrom most of the continuum arises. Study of this molecule in the umbral spectrum may also provide the solar isotopic abundance ratio N(S32)/N(S34).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00150132
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    On the O2 Schumann-Runge band system in sunspots (1979)
    Springer
    Solar physics 63 (1979), S. 79-81 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The visibility in the umbral ultraviolet spectrum of the O2 Schumann-Runge absorption band system has been explored. It is found that the band system may be visible in high dispersion sunspot spectrum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00155696
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    (A-X) system of SiO in sunspots (1979)
    Springer
    Solar physics 62 (1979), S. 77-82 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The calculated equivalent widths of some lines of SiO in the umbral spectrum suggest that strong lines of Si28O16, Si29O16 and Si30O16 may be present in the sunspot ultraviolet spectrum. We also find that between 37 000 and 47 000 cm−1 the quasi-continuous absorption of SiO dominates all other absorptions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00150133
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    On the gamma system of nitric oxide in sunspots (1978)
    Springer
    Solar physics 58 (1978), S. 343-346 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract With the aim of investigating the resonance system of NO, equivalent width calculations have been made for the 213.575 nm, Q 1(31.5) line of the 1–0 band of γ-system of NO for the photospheric HSRA model, and for the line 214.012 nm, Q 1(25.5) line of the same band system for Zwaan's (1974) sunspot model. Calculations show that γ-band system would not show up in the photospheric spectrum whereas a sunspot model yields an equivalent width of 72 mÅ suggesting that sunspots may provide relatively more favourable conditions for the detections of the resonance systems of some abundant molecules in the inaccessible ultraviolet region.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00157280
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Isotopic lines of SiO in sunspots (1978)
    Springer
    Solar physics 59 (1978), S. 353-356 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract As the isotopic shift for the vibration rotation band is generally much larger than the isotopic shift for the corresponding electronic transitions and thus facilitating separation of isotopic lines, the vibration rotation bands of SiO may find use in the determination of isotopic abundance ratio Si28 ∶ Si29 ∶ Si30. To help identify the isotopic lines of SiO the wavenumbers for Si29O16 and Si30O16 have been calculated with an uncertainty of ±0.05 cm−1. Taking note of the fact that SiO shows strong vibration rotation bands in the spectra of some cool stars the equivalent width calculations for P(40) and R(40) lines of the 1-0 and 2-1 vibration rotation bands of Si29O16 and Si30O16 have been made at the centre of the disc for the model ZSM-74 using two values of isotopic abundance ratio and three values of dissociation energy. The search for the isotopic lines of SiO near 7 to 8μm is recommended in low noise centre to limb sunspot spectrum scans with a view to help improve the isotopic ratio Si28 ∶ Si29 ∶ Si30 and oscillator strengths for the vibration-rotation transitions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00951839
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    On the infrared opacity of sunspots (1979)
    Springer
    Solar physics 64 (1979), S. 255-259 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In the umbral atmosphere the depth dependence of the opacity due to the vibration rotation bands of various abundant molecules in the wavelength region 1 μm to 10 μm has been calculated. In the higher layers of the umbral atmosphere, the molecular opacity seems to dominate the opacity due to the negative hydrogen ion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00151437
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    Paper (German National Licenses)
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