Non-Equilibrium, Temperature and Density Effects on Common Spectral Line Diagnostics

Details Non-Equilibrium, Temperature and Density Effects on Common Spectral Line Diagnostics Non-Equilibrium, Temperature and Density Effects on Common Spectral Line Diagnostics

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sh41b03e&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SH41B-03

Physics

7509 Corona, 7511 Coronal Holes

Scientific paper

The ratio of spectral lines of different ions are often used as plasma diagnostics in the transition region and corona to determine e.g. elemental abundances and electron density. This approach is usually based on the assumption that the plasma is in collisional equilibrium. We choose as an example a common first ionization (FIP) effect diagnostic, the ratio of Ne VI and Mg VI lines. We demonstrate nonequilibrium ionization effects on the ratio of the ion fractions of the two ions for a variety of simple flows through the transition region. Calculating the spectral line ratios for a few examples, we then show that nonequilibrium effects, as well as density and temperature effects, must be evaluated for each line ratio used in the diagnostics.

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