Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...121..155h&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 121, no. 1, May 1983, p. 155-157.
Astronomy and Astrophysics
Astrophysics
6
H Alpha Line, K Lines, Lyman Alpha Radiation, Oso-8, Solar Prominences, Solar Spectra, Calcium, Emission Spectra, Potassium, Spectrum Analysis
Scientific paper
Using simultaneous observations of hydrogen Lyman-α and Ca II K lines obtained with the OSO 8 LPSP instrument, the authors compare Lα emission from a quiescent prominence with those predicted from the existing theoretical models. They use the observed relation between Hα and Ca II K integrated intensities to obtain an estimate of E(Hα)/E(Lα) vs. E(Hα). This ratio differs significantly from those predicted theoretically under the assumption of complete frequency redistribution during the scattering of Lα photons. On the other hand, using the partial-redistribution treatment in the Lα wings, as suggested by Milkey et al., the authors arrived at a reasonable agreement with the corresponding theoretical curve. The possible influence of macroscopic velocities on line ratios is briefly discussed.
Heinzel Petr
Vial Jean-Claude
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