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A Note on the Hydrogen Chromosphere

Published online by Cambridge University Press:  24 October 2008

W. H. McCrea
W. H. McCrea
Affiliation:
Trinity College
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Extract

It is well known that eclipse observations show that the chief constituents of the higher levels of the sun's chromosphere are ionised calcium and hydrogen. The equilibrium of the calcium has formed the subject of Milne's important researches. The hydrogen presents a rather different problem owing to the large number of possible quantum states that have to be considered.

Type
Research Article
Information
Mathematical Proceedings of the Cambridge Philosophical Society , Volume 24 , Issue 4 , October 1928 , pp. 506 - 515
Copyright
Copyright © Cambridge Philosophical Society 1928

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References

* Davidson, and Stratton, , Memoirs Roy. Astron. Soc. LXIV, Part IV (1927). Added later.Google Scholar See also Davidson, , Minnaert, , Ornstein, and Stratton, , Monthly Notices, Roy. Astron. Soc. LXXXVIII, p. 536 (1928). Mr Stratton very kindly showed me these results before publication.CrossRefGoogle Scholar

* Sugiura, , J. de Phys. et le Rad. (VI), VIII, p. 113 (1927).CrossRefGoogle Scholar

† Schrödinger, , Ann. d. Phys. LXXX, p. 489 (1926).CrossRefGoogle Scholar

* Values up to l = 4 can be obtained from Sugiura's Table III, but they differ from ours by a factor which is not quite unity owing, presumably, to some slight difference in the values assumed for the absolute constants.Google ScholarAdded later. The above was written in 03 1928, and since then a paper on the hydrogen line intensities byGoogle ScholarSlack, P. G., Phys. Rev. XXXI, p. 527 (04, 1928), has been published. Values for are included in the more extensive table there given, but it still seems useful to give our values for the sake of the subsequent discussion of the variation with l and l′.CrossRefGoogle Scholar

* Were the assembly in thermodynamic equilibrium the distribution must, of course, obey Boltzmann's law. What we see is that it could not be calculated from the weights and energy levels of the atoms supposed independent.Google Scholar

* See §3.Google Scholar