Abstract
view Abstract Citations (8) References (24) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Measurements of quiescent prominence spectra - Ca/+/ double-lambda 8542, 8498 and He lambda 4471, Ti/+/ lambda 4468 Landman, D. A. Abstract High-dispersion measurements of the line profiles of the Ca(+) lines at 8542 and 8498 A and the He 4471-A, Ti(+) 4468-A line pair in the spectra of quiescent solar prominences are presented. The measured Ca(+) and He line profiles are found to be accurately described by the two-component model of Landman et al. (1977) and Landman and Mongillo (1979) in which the prominence along the line of sight consists of a low-temperature region surrounded by high-temperature material representing contributions from the prominence/corona interface; the Ti(+) lines are too weak to distinguish among different models. The Ca(+) data allow a constant infrared line source function for the low-temperature region of 50,000 ergs/sq cm per sec per ster per A to be calculated, which is in disagreement with the previous Ca(+) excitation equilibrium calculations but is consistent with generally accepted values of the electron density and temperature. The integrated intensity ratio of 0.048 between Ti(+) and He emission indicates a low-temperature region temperature of 6620 K and microturbulence of 5.1 km/sec and high-temperature microturbulence of 11 km/sec for Ca(+) and 20 km/sec for He. The results exclude macroturbulence as a possible explanation of the generally observed wing enhancements. Publication: The Astrophysical Journal Pub Date: May 1980 DOI: 10.1086/157944 Bibcode: 1980ApJ...237..988L Keywords: Calcium; Helium; High Dispersion Spectrographs; Line Spectra; Solar Prominences; Solar Spectra; Electron Density (Concentration); Electron Energy; Fluid Boundaries; Infrared Spectra; Plasma Turbulence; Solar Corona; Solar Temperature; Spectrum Analysis; Tables (Data); Titanium; Solar Physics full text sources ADS |
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