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  • 1
    Electronic Resource
    Electronic Resource
    The symbiotic stellar lines at 6830 Å, 7088 Å; An origin in optically thick fluorescence (1991)
    Springer
    Astrophysics and space science 185 (1991), S. 265-275 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The question of the origin of the symbiotic stellar lines at 6830 Å and 7088 Å, recently proposed to arise from Raman scattering of ultraviolet Ovi lines by hydrogen, is examined quantitatively by comparing line intensities expected from this process with the intensity of an Feii line photoexcited by one of the same Ovi lines. It appears that Raman scattering does not yield sufficient intensity to account for the symbiotic lines. An alternative mechanism for producing the lines exists, however, in off-line-center photoexcitation of optically thick hydrogen by the Ovi lines. This gives intensities which are higher than Raman intensities, and which are more consistent with the Feii fluorescent line intensity. Observed further redward shifts are also explained by the mechanism. It is therefore suggested that the proposed hypothesis of Ovi−Hi interaction may be valid, but that the process involved is probably not second-order Raman scattering but first-order fluorescent scattering.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00643193
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Fe xiv and other line identifications in the solar EUV spectrum (1991)
    Springer
    Solar physics 135 (1991), S. 343-351 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A number of solar extreme ultraviolet lines, previously unidentified or given assignments at the time of observation, are found to be coincident in wavelength with transitions recently identified as aluminum-like or magnesium-like in the laboratory. Three tables summarize the results of this comparison, which does not imply positive identifications but suggests that several assignments may be valid. Additional assignments are proposed in other ions and a revised table of predicted and observed forbidden line wavelengths in the Ne i sequence is included.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00147506
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Opacity in the Si iii Spectrum (1998)
    Springer
    Solar physics 182 (1998), S. 37-63 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The opacities of the Si iii resonance line at 1206.5 Å and component lines of the UV 4 multiplet near 1300 Å are analyzed and re-examined in published spectra, taking account of improved expressions for photon escape probabilities and making use of an intensity/linewidth analysis recently developed. Level populations and line intensities are computed to extend knowledge of the optically thin spectrum to lower densities. Diagnostic diagrams of line ratios are included. Opacities are found to be higher than in previous treatments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1005057808400
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    On helium-like 1s2l−1snl′ transitions in solar flare spectra (1974)
    Springer
    Solar physics 36 (1974), S. 121-128 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Expected wavelengths and intensities are computed for 1s2l−1snl′ transitions in helium-like ions of the abundant elements from oxygen to iron, under coronal conditions. Probable observations of some of these lines, in the spectra of solar flares, are discussed and attention is called to a possible reversal of singlet and triplet intensities as compared to laboratory observations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00151552
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Expected intensities of solar forbidden lines emitted from 2p k (k = 2, 3, 4) configurations (1983)
    Springer
    Solar physics 85 (1983), S. 41-51 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Predicted intensities of all significant transitions within the ground configurations of six-, seven-, and eight-electron ions are tabulated for solar conditions, on a common scale. Some applications of the table entries to line identification and emission measure analysis are presented, including proposed Mg vi classifications for the coronal lines 3488.5 Å and 3502.5 Å.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00148256
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  • 6
    Electronic Resource
    Electronic Resource
    Proposed Mg V, Fe XIV and forbidden Fe XVII line identifications in the EUV solar spectrum (1982)
    Springer
    Solar physics 81 (1982), S. 59-61 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Some line identifications in solar disk and limb spectra are proposed on the basis of recent laboratory and theoretical results reported in the literature, including allowed lines of Mgi and Fexiv in the EUV spectrum and an expected forbidden line of Fexvii near 1190 Å.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00151979
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  • 7
    Electronic Resource
    Electronic Resource
    Observation of possible Fe xvii 2p 53p(1S0)-2p 53s(1 P 1, 3 P 1) transitions in spectra of a solar active region and flare (1975)
    Springer
    Solar physics 43 (1975), S. 111-115 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Expected wavelengths and relative intensities are obtained, from calculations of other workers, for the hitherto unobserved transitions 2p 53p(1 S 0)-2p 53s(1 P 1, 3 P 1) in Fe xvii. A candidate pair of lines at 197.05 Å and 242.09 Å was found in laboratory spectra and appears to be present in the spectra of a solar active region observed by the OSO-7 Goddard spectroheliograph, and in the spectrum of a Skylab-observed solar flare.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00155148
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Diagnostic application of highly ionized iron lines in the XUV spectrum of a solar flare (1984)
    Springer
    Solar physics 92 (1984), S. 199-216 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Recent atomic data have been used to analyze a solar flare spectrum obtained with the Goddard Space Flight Center's grating spectrometer on the OSO-5 satellite. There exist in the wavelength region 90–200 Å strong lines from each of the ions Fe xviii-Fe xxiv. The Fe xxi lines can be used as an electron density diagnostic for the 107 K plasma. From our analysis of a particular flare, we find a steep positive slope in the emission measure between 106.5 and 107.2 K and an electron density of ∼4 × 1011 cm−3 at 107 K. We emphasise the need for high spectral and spatial resolution observations of solar flares in this wavelength region, which has to date been largely neglected.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00157246
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  • 9
    Electronic Resource
    Electronic Resource
    Re-analysis of an observed solar near-infrared eclipse spectrum (1993)
    Springer
    Solar physics 143 (1993), S. 197-200 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The spectroscopic assignments of Olsen, Anderson and Stewart (1971), for their observed solar eclipse wavelengths in the near-infrared region between 1µm and 3µm, are reviewed in the light of more recent information. Several assignments are shown to need revision, and alternate candidates are proposed, including the possibility of an interesting forbidden line emitted from the high metastable level 3s3p3d (4F9/2) of Fe XIV.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00619105
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  • 10
    Electronic Resource
    Electronic Resource
    Solar line identifications in the calcium isoelectronic sequence (1994)
    Springer
    Solar physics 151 (1994), S. 41-49 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Wavelength coincidences are noted between laboratory and solar spectral line lists for the twenty-electron ions CaI, TiIII, CrV, MnVI, FeVII, and NiIX, which imply likely identifications for a large number of unidentified lines in the solar lists. These identifications should be useful, e.g., for improving chromospheric/coronal abundance estimates of the less abundant elements titanium, chromium, and manganese.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00654080
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