Structure and spectrum of quiescent prominences. IV - The ultraviolet ionization continua of hydrogen and helium

Details Structure and spectrum of quiescent prominences. IV - The ultraviolet ionization continua of hydrogen and helium Structure and spectrum of quiescent prominences. IV - The ultraviolet ionization continua of hydrogen and helium

May 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...268..398h&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 268, May 1, 1983, p. 398-402.

Other

21

Solar Prominences, Solar Spectra, Ultraviolet Spectra, Continuous Spectra, Helium, Hydrogen, Ionization, Lyman Spectra

Scientific paper

The formation of the ground-state ionization continua of hydrogen and neutral helium in quiescent prominences has been investigated by using isothermal and isobaric slab models. The hydrogen and helium ionization equilibria are dominated by the extreme ultraviolet radiation field incident on the prominence. The Lyman continuum brightness is dependent only on the incident radiation and the optical thickness of the prominence. The ratio of the intensity in the He I to the Lyman continuum is principally a function of the hardness of the incident radiation and the helium abundance and is only secondarily a function of the optical thickness of the slab and the gas pressure. The color temperatures of the continua, when corrected for optical depth effects, are good indicators of the electron temperature in the prominence. The slab models used in this study, which were developed to reproduce the visible spectrum hydrogen and helium lines, are in reasonable agreement with existing ultraviolet observations.

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