Coronal Fe ix line intensities and electron density diagnostics

Details Coronal Fe ix line intensities and electron density diagnostics Coronal Fe ix line intensities and electron density diagnostics

Jun 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001mnras.324l...7s&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 324, Issue 1, pp. L7-L10.

Astronomy and Astrophysics

Astronomy

4

Atomic Processes, Sun: Corona, Sun: Flares

Scientific paper

The relative intensities of the most prominent extreme-ultraviolet lines of Feix, seen in the outer atmospheres of the Sun and other stars, have been shown to be inconsistent with the best available atomic data. The density-sensitive Feix λ241.7/λ244.9 line intensity ratio, for example, yields electron densities in the solar corona that disagree with those obtained from ratios in other ions, particularly at higher densities. We show here that these differences can be largely removed by using newly calculated atomic data, in particular electron impact collision strengths that include pronounced resonance features, and by incorporating a measure of line excitation by collisional excitation and cascading.

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