Observed and theoretical profiles of the SI II lines at lambda 1814

Details Observed and theoretical profiles of the SI II lines at lambda 1814 Observed and theoretical profiles of the SI II lines at lambda 1814

Feb 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978soph...56..263f&link_type=abstract

Solar Physics, vol. 56, Feb. 1978, p. 263-273.

Physics

2

Line Spectra, Silicon, Solar Limb, Solar Spectra, Chromosphere, Emission Spectra, Solar Atmosphere, Spectral Line Width, Spectrum Analysis

Scientific paper

Emission line spectra observed at the limb of the solar disc are presented for transitions of singly ionized silicon at lambdas 1816.93, 1817.45 and 1808.01. The profiles show self-reversals in the line cores. A non-LTE analysis for a simplified model of the silicon ion is presented, and calculated line profiles are compared with the observations. The study indicates that some modification of the Vernazza et al. (1973) model of the solar chromosphere in the transition region is needed to reconcile the calculated and observed profiles.

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