SI II line ratios in the sun

Details SI II line ratios in the sun SI II line ratios in the sun

Feb 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...289..844d&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 289, Feb. 15, 1985, p. 844-848.

Astronomy and Astrophysics

Astrophysics

14

Atomic Energy Levels, Line Spectra, Radiant Flux Density, Silicon, Solar Atmosphere, Ultraviolet Spectra, Electron Density (Concentration), Emission Spectra, Ion Density (Concentration), Maxwell-Boltzmann Density Function, Spectral Energy Distribution, Transition Probabilities

Scientific paper

New atomic data for Si II have been used to predict level populations and emission-line intensity ratios for electron densities and temperatures appropriate to the solar atmosphere. The electron impact collision rates are significantly increased by the presence of complex resonance structure in the low-energy collision strength. Generally good agreement is found with observations obtained from the Naval Research Laboratory slit spectrograph on Skylab. The effect of deviations from a Maxwellian electron energy distribution on the predicted line intensities is also briefly discussed.

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