Physics
Scientific paper
Dec 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982soph...81..339i&link_type=abstract
Solar Physics, vol. 81, Dec. 1982, p. 339-354.
Physics
4
Diffusion Theory, Helium Afterglow, Solar Prominences, Solar Radiation, Atomic Energy Levels, Atomic Excitations, Gas Ionization, H Lines, Helium Atoms, Photoionization, Radiation Absorption, Radiative Recombination, Solar Corona, Solar Spectra
Scientific paper
Integral equations describing the diffusion of multilevel helium atom radiation are solved, taking into consideration the absorption of radiation by hydrogen, and the mechanism of the excitation of helium radiation in prominences is elucidated. It is shown that neutral helium is ionized by coronal radiation mainly in the 100-300 A spectral region; the degree of helium ionization is maximum at the boundary planes. The photorecombination to the 2(3)S and 2(1)S levels and the photoionizations by the Balmer continuum of the sun are very nearly balanced and this determines the population of these levels. The 2(3)S level is destroyed by electron impacts and the 2(1)S level decays via the escape of the quanta of wavelength 584 through the 2(1)P level. The radiation of helium is generated in the vicinity of the boundary planes in the region of penetration of radiation of wavelength about 200 A, where the density of matter decreases gradually down to the coronal value.
Iakovkin N. A.
Lhagvazhav C.
Zeldina Iu. M.
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