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- W2057594674 abstract "The formation of helium lines and continua in an atmospheric model representing the medium quiet sun has been investigated considering principally the influence of: (i) changes in the temperature gradient at Transition Region (TR); (ii) the coronal radiation and (iii) the overlapping of He II Ly α at 304 Å and the continuum radiation of He I at |$lambdaleqslant504$| Å. By diminishing the thermal gradient in the Transition Region a large part of the helium observations are reproduced. This is the case for the He II resonance λ 304 line which is collisionally controlled and is formed at |$1.0 times {10}^{5},text{K},$| and the He I resonance line at 584 Å which is also collisionally controlled but is formed at deeper layers with a mean temperature of |$2.5 times {10}^{4},text{K}.$| The He II continuum at 228 Å as well as the Lβ 1ine at 256 Å can be adjusted to observations if a characteristic solar coronal flux is incident on the optimized Transition Region. No reasonable coronal radiation can account for the observed He II line or continuum intensities alone." @default.
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- W2057594674 date "1989-09-01" @default.
- W2057594674 modified "2023-09-28" @default.
- W2057594674 title "The helium line formation in late-type stars - I. The quiet sun" @default.
- W2057594674 doi "https://doi.org/10.1093/mnras/240.1.23" @default.
- W2057594674 hasPublicationYear "1989" @default.
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