The helium singlet-to-triplet line ratio in solar prominences.

Details The helium singlet-to-triplet line ratio in solar prominences. The helium singlet-to-triplet line ratio in solar prominences.

Mar 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...319..669s&link_type=abstract

Astronomy and Astrophysics, v.319, p.669-672

Astronomy and Astrophysics

Astrophysics

12

Sun: Prominences, Lines: Formation

Scientific paper

The emissions of the He singlet line at 6678Å and the He triplet line at 4471Å are simultaneously observed in three solar prominences. For two of them, the line pairs He-D_3_/Hbeta_ and Ca^+^8662/Hbeta_ were also observed. Comparisons with model calculations show that the emission line ratios require low densities (n_H_=~3.10^10^cm^-3^), low gas pressures (P_g_=~0.02dyn/cm^2^), and large physical slab widths. The relative He-to-H number density cannot be much lower than y=0.1.

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