Formation of the O I resonance triplet and intercombination doublet in the solar chromosphere

Astronomy and Astrophysics – Astronomy

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Atomic Energy Levels, Chromosphere, Oxygen Spectra, Resonance Lines, Solar Atmosphere, Ultraviolet Astronomy, Atmospheric Models, H Lines, Late Stars, Lyman Beta Radiation, Photoionization, Ultraviolet Spectra

Scientific paper

Spectrum synthesis calculations are presented for the O I resonance triplet at 1304 A and the intercombination doublet at 1358 A for the solar atmosphere and several variants, allowing for triplet fluorescence by the Ly-beta emission of H I. Profiles, synthesized from a seven-level plus continuum O I atom are compared to observations taken with the high-resolution spectrometer on OSO 8. It is found that the O I triplet emission is dominated by the Ly-beta fluorescence and that the agreement between observations and profiles computed with current chromospheric models is much improved over earlier studies.

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