Coronal line intensities for ions with fine-structured ground states - SI X

Details Coronal line intensities for ions with fine-structured ground states - SI X Coronal line intensities for ions with fine-structured ground states - SI X

Dec 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...116..224s&link_type=abstract

Astronomy and Astrophysics, vol. 116, no. 2, Dec. 1982, p. 224-231.

Astronomy and Astrophysics

Astrophysics

8

Ground State, Line Spectra, Positive Ions, Solar Corona, Solar Spectra, Emissivity, Extreme Ultraviolet Radiation, Fine Structure, Silicon, Tables (Data)

Scientific paper

The data of Saha and Trefftz (1982) are used to determine populations of the 15 lowest levels (2s2 2p, 2s2p2, 2p3) of Si X observed in the solar corona. A simple formula for the balance between the two ground state levels makes it possible to quickly estimate the relative importance of radiative and collisional excitations, and to determine the cascade contribution to the effective impact excitation rate. The present line intensity ratios diverge from those of Flower and Nussbaumer (1975) by approximately 5%, except for I272/I258, which is more than 10% less in the present calculations due to a 10% higher emissivity in I258.

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