Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...329..482a&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 329, June 1, 1988, p. 482-492.
Astronomy and Astrophysics
Astrophysics
19
Helium, Line Spectra, Solar Radiation, Solar Spectra, Ultraviolet Spectra, Carbon, Lyman Spectra, Solar Activity, Solar Maximum Mission
Scientific paper
Doppler images made cospatially and nearly cotemporally in C IV and He II lines with the Ultraviolet Spectrometer/Polarimeter experiment on SMM permit a direct comparison of macroscopic velocity amplitudes observed for the two ions. Similarly, the line profiles for the two ions permit a comparison of the total line-broadening velocities, which are the root mean squares of the thermal and nonthermal microscopic velocities. Assuming that the C IV ion is predominant at 100,000 K, arguments are presented based on relative velocity amplitudes and line intensities that indicate a most probable temperature for the He II plasma of approximately 80,000 K. Collisional processes play a major role in the excitation of solar He II radiation in both active and quiet regions.
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