Abstract
Under conditions pertaining to the middle chromosphere, the nlj-substates of the n = 2 and n = 3 states of hydrogen are found to be populated proportionally to their degree of degeneracy. Thus, the non-LTE formation of the Hα line is not expected to be influenced by some exotic excitation conditions in one of its seven components. The overpopulation of the 2S 1/2 substate relative to the 2P 3/2 substate does not depend upon details of the radiative transfer in Hα, so that it rests wholly on the transfer in Lα (Milkey and Mihalas, 1973). One-component plane parallel models of the chromosphere thus further predict that the 2S 1/2-2P 3/2, 9873 MHz (3.04 cm) line will not be observable in the radio-spectrum of the quiet Sun.
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Astronomische Mitteilungen der Eidgenössischen Sternwarte Zürich, Nr. 367.
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Zelenka, A. The seven components of Hα and the 9873 MHz line. Sol Phys 58, 17–29 (1978). https://doi.org/10.1007/BF00152551
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DOI: https://doi.org/10.1007/BF00152551