Physics
Scientific paper
Aug 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976soph...49..315l&link_type=abstract
Solar Physics, vol. 49, Aug. 1976, p. 315-327.
Physics
6
Chromosphere, Helium Ions, Solar Eclipses, Solar Spectra, Emission Spectra, Equations Of State, Solar Atmosphere, Solar Limb, Solar Temperature, Steady State, Vertical Distribution
Scientific paper
Slitless spectrograms obtained during the eclipse of June 10, 1972, have been analyzed to determine the height distribution of the He D3 line intensity. For undisturbed regions, the maximum D3 line intensity is confirmed to exist at about 1700 km above the limb. Besides this maximum, a considerable intensity may be observed at low heights (less than 1000 km) in plages. Analysis of these observations for heights above 1000 km has been carried out in terms of the low-temperature mechanism of triplet helium emission, taking into account helium ionization by XUV radiation. The density dependence of the 2(3)S level population at different XUV flux values has been calculated. The observations give an electron density of about 20 billion per cu cm in the chromosphere at a height of 2000 km. The probable coincidence of small H and He filaments in the middle chromosphere is discussed.
Akimov L. A.
Belkina I. L.
Diatel N. P.
Livshits Moisey A.
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