Abstract
Slitless spectrograms obtained during the eclipse of 10 June 1972 have been analyzed to determine the height distribution of the D3 He line intensity.
For undisturbed regions the maximum of D3 line intensity is confirmed to exist at about 1700km above the limb. Besides the above mentioned maximum, in plages a considerable intensity may be observed at low heights (h < 1000 km).
An analysis of these observations for h > 1000 km has been carried out within the low temperature mechanism of triplet helium emission taking into account the helium ionization by XUV radiation. The density dependence of the 23 S level population at different XUV flux values has been calculated. Our observations give N e ≈ 2 × 1010 cm−3 in the chromosphere at h = 2000 km. The probable coincidence of the H and He emission small filaments in the middle chromosphere is discussed.
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Livshits, M.A., Akimov, L.A., Belkina, I.L. et al. Helium emission in the middle chromosphere. Sol Phys 49, 315–327 (1976). https://doi.org/10.1007/BF00162455
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DOI: https://doi.org/10.1007/BF00162455