On the intensity ratio of emission lines of NA 1 D1 to D2 in prominences

Details On the intensity ratio of emission lines of NA 1 D1 to D2 in prominences On the intensity ratio of emission lines of NA 1 D1 to D2 in prominences

Apr 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983soph...84...49n&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 84, April 1983, p. 49-61.

Physics

2

Hydrogen Atoms, Line Spectra, Sodium, Solar Prominences, Solar Spectra, Emission Spectra, H Lines, Sodium Hydrides, Solar Flares, Tables (Data)

Scientific paper

Spectroscopic observations of the Na I D emission lines of prominence made with the Domeless Solar Telescope at the Hida Observatory (Japan) are discussed. It is found that when active prominences are bright in the D2 emission line, the intensity ratio of D1 to D2 deviates significantly from the theoretical ratio of the optically thin case. The intensity ratio, however, is close to the theoretical ratio for most of the quiescent prominences. What is more, the full widths at half maximum intensity of the D2 emission line for active prominences become wider than those of the D1 line as the intensity of the D2 line gets higher. These observed features clearly reveal that the emitting region of the Na I D lines is optically thick in some types of prominences. Non-LTE calculations are made by taking the ionization degree of hydrogen atoms and the thickness of the prominences and the electron temperature as free parameters. It is demonstrated that the electron temperature of the emitting region of the Na I D lines should be as low as 4000 K for an explanation of the large optical thickness of the Na I D lines for active prominences.

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