Ionized helium in quiet prominences. I - Cold excitation of He II

Details Ionized helium in quiet prominences. I - Cold excitation of He II Ionized helium in quiet prominences. I - Cold excitation of He II

Oct 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986kfnt....2...74m&link_type=abstract

Kinematika i Fizika Nebesnykh Tel (ISSN 0233-7665), vol. 2, Sept.-Oct. 1986, p. 74-79. In Russian.

Physics

Atomic Excitations, Helium Ions, Ion Recombination, Lyman Spectra, Solar Prominences, Solar Spectra, Radiative Transfer

Scientific paper

The cold excitation of the He II 468.6 nm line in structurally and physically inhomogeneous models of quiescent prominences is examined. Statistical equilibrium equations for levels 2-5 and the continuum are solved along with approximate radiative transfer equations for wavelengths of 30.4, 25.6, 24.3, 23.5 nm and below 22.8 nm. It is shown that the cold excitation of the He II 468.6 nm line is possible only in faint prominences; in bright prominences, this line is excited by electron collisions in the space between filaments at high temperatures.

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