Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998apjs..119..105w&link_type=abstract
The Astrophysical Journal Supplement Series, Volume 119, Issue 1, pp. 105-120.
Astronomy and Astrophysics
Astronomy
56
Line: Profiles, Sun: Chromosphere, Sun: Uv Radiation
Scientific paper
We present high-resolution observations of the higher H Lyman series lines taken with the Solar Ultraviolet Measurements of Emitted Radiation (SUMER) experiment flown on the Solar and Heliospheric Observatory (SOHO) spacecraft. We have used systematic observations extending from disk center to the solar limb to compute average profiles for representative solar features of the quiet Sun, limb-brightening curves, and full-disk, quiet-Sun profiles for Lybeta through Lylambda(11) and the Lyman continuum. The effects of radiative transfer are apparent in all of the line profiles we studied. The average quiet-Sun profiles for Lybeta through Lyɛ are self-reversed, and the remaining lines are flat-topped. The characteristics of the line profiles vary markedly with intensity. We observe strong enhancements in the red wings of network profiles, while the faint cell-center profiles are nearly symmetric. We also find that the intensities of the H Lyman lines increase at the limb, although the limb brightening is weak compared to optically thin transition region emission lines and largely obscured by the intensity variations observed in the quiet Sun.
Mariska John T.
Warren Harry P.
Wilhelm Klaus
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