On the excitation of lower levels of singlet helium in quiescent prominences

Details On the excitation of lower levels of singlet helium in quiescent prominences On the excitation of lower levels of singlet helium in quiescent prominences

May 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984soph...92..153m&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 92, May 1984, p. 153-160.

Physics

2

Atomic Energy Levels, Helium, Solar Prominences, Solar Spectra, Continuous Spectra, Line Spectra

Scientific paper

This paper deals with the excitation of the helium singlet level 21P in the homogeneous and filamentary models of quiescent prominences with following parameters: the optical thickness at the limit of helium Lyman continuum τM1c = 0.1 - 100, Te = 7000K, ne = 5×1010 cm-3. Assuming a model He I atom with seven discrete levels (11S, 23S, 21S, 23P, 21P, 33D, 31D) and the continuum the steady state equations for the levels 23S, 21P and the continuum have been solved together with the radiative transfer equations for the line λ584 Å and the continuum λ ≤ 504 Å.

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