Abstract
The situation that a forbidden line is produced from a metastable level, and is optically thin is used for calculating the upper limit of the electron density so that the line is observable. These upper limits for various lines may give the idea about the electron density in the emitting region of the solar corona and the transition region.
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Chandra, S. Electron density in solar atmosphere from forbidden lines. Astrophys Space Sci 92, 223–227 (1983). https://doi.org/10.1007/BF00653603
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DOI: https://doi.org/10.1007/BF00653603