Abstract
A direct method for determining electron densities from emission line intensities of ions in the beryllium isoelectronic sequence is described and then applied to the analysis of extreme ultraviolet Ciii and Ov spectra from both quiet and active areas in the solar transition region. The results are consistent with a value of N e T e = 6 × 1014 cm-3K for the quiet Sun at temperatures of 5 × 104 to 3 × 105K. Electron densities are approximately five times greater in active regions than in the quiet Sun.
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Munro, R.H., Dupree, A.K. & Withbroe, G.L. Electron densities derived from line intensity ratios: Beryllium isoelectronic sequence. Sol Phys 19, 347–355 (1971). https://doi.org/10.1007/BF00146063
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DOI: https://doi.org/10.1007/BF00146063