Diffusion effects on the line intensities of He I and He II in the solar transition region

Details Diffusion effects on the line intensities of He I and He II in the solar transition region Diffusion effects on the line intensities of He I and He II in the solar transition region

Dec 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975apj...202l.101s&link_type=abstract

Astrophysical Journal, vol. 202, Dec. 1, 1975, pt. 2, p. L101-L105.

Astronomy and Astrophysics

Astrophysics

44

Helium, Solar Atmosphere, Solar Spectra, Transition Layers, Atmospheric Diffusion, Atmospheric Temperature, Chromosphere, Line Spectra, Luminous Intensity, Solar Corona, Temperature Distribution

Scientific paper

A heuristic treatment of diffusion in the solar chromosphere-corona transition region is developed. It is shown that diffusion becomes increasingly important with steeper temperature gradients, in active and quiet regions relative to coronal holes, and with increasing excitation potential. Numerical calculations are made for the resonance lines of He I and He II and show that diffusion can enhance these lines. Thus the helium lines may appear relatively weak in coronal holes due to a weakening of the enhancement mechanism. Most transition region lines will be less affected by diffusion than He I or He II.

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