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  • 1
    Electronic Resource
    Electronic Resource
    Ne  vii emission lines in the solar EUV spectrum (1999)
    Springer
    Solar physics 186 (1999), S. 231-242 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Recent calculations of electron and proton impact excitation rates in Ne vii are used to calculate theoretical emission line ratios involving both Δn=0 (2–2) and Δn=1 (2–3) transitions in the ∼ 97–895 Å wavelength range. A comparison of these with existing solar observations, obtained by instruments on rocket flights and on the Skylab mission, reveals generally good agreement between theory and observation. This provides experimental support for the accuracy of the atomic data adopted in the line ratio calculations, and implies that the latter may be applied with confidence to the analysis of solar and stellar spectra from current and future satellite missions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1005143807055
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Electron densities above a polar coronal hole based on improved Si  IX density diagnostics (1999)
    Springer
    Solar physics 188 (1999), S. 73-80 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Using new close-coupling excitation rates for the C-like ion Si ix, density-diagnostic ratios based on Si ix lines have been re-evaluated and applied to a sequence of CDS observations taken above a polar coronal hole. The derived electron densities are in excellent agreement with previous values of Neestimated from the N-like ion Si viii for another coronal hole. The confirmed trend is for a fall-off of one order of magnitude within the first 0.3 R⊙above the limb. These densities are well fitted with an analytic formula for the density profile out to at least 8 R⊙, by which stage the electron density has fallen to ∼4×103 cm−3, from 1.5×108 cm−3at 1.0 R⊙.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1005190912529
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
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