The solar XUV He I and He II emission lines. I - Intensities and gross center-to-limb behavior

Details The solar XUV He I and He II emission lines. I - Intensities and gross center-to-limb behavior The solar XUV He I and He II emission lines. I - Intensities and gross center-to-limb behavior

Mar 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...220..683m&link_type=abstract

Astrophysical Journal, Part 1, vol. 220, Mar. 1, 1978, p. 683-691.

Astronomy and Astrophysics

Astrophysics

25

Chromosphere, Helium Ions, Limb Darkening, Solar Corona, Spectroheliographs, Ultraviolet Spectra, Data Reduction, Electron Scattering, Resonant Frequencies, Solar Radiation, Temperature Gradients

Scientific paper

The center-to-limb variation of the He II 304- and 256-A lines and He I 584- and 537-A lines is derived for different solar features, but averaged over the chromospheric supergranulation structure. The general trend is for limb brightening in quiet-sun regions, limb neutrality in unipolar magnetic regions (UMR), and limb darkening in polar coronal holes. The center-to-limb behavior in these optically thick emission lines indicates collisional excitation and decreasing transition-region temperature gradients with respect to optical depth in the sequence quiet sun to UMR to coronal hole.

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