The He II 1640 a multiplet observed from solar prominences

Details The He II 1640 a multiplet observed from solar prominences The He II 1640 a multiplet observed from solar prominences

Jan 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...403..434l&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 403, no. 1, p. 434-440.

Astronomy and Astrophysics

Astrophysics

17

Solar Prominences, Solar Spectra, Ultraviolet Spectra, Abundance, Emission Spectra, Skylab Program, Solar Atmosphere

Scientific paper

We describe an analysis of EUV spectra of solar prominences taken with the SO82-B instrument on Skylab, with special attention to the 1640 A 2l-3l arcmin multiplet of He II. It appears that the line intensities emitted from plasma at temperatures between 2 x 10 exp 4 and 4 x 10 exp 4 K can be explained by an ionization equilibrium model, incorporating photoexcitation and photoionization by incident radiation from the solar disk. With this interpretation, the data are consistent with an abundance for He of 0.1 relative to H. Some problems remain, however, in predicting the relative intensities of the components of the 1640 A multiplet.

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