Effects of flows and non-equilibrium ionization on some C IV line ratios on the Sun.

Details Effects of flows and non-equilibrium ionization on some C IV line ratios on the Sun. Effects of flows and non-equilibrium ionization on some C IV line ratios on the Sun.

Oct 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...302..285s&link_type=abstract

Astronomy and Astrophysics, v.302, p.285

Astronomy and Astrophysics

Astrophysics

4

Mhd, Sun: Transition Region, Sun: Uv Radiation

Scientific paper

We investigate the deviations from ionization equilibrium occurring in coronal loops hosting steady-state siphon flows, and their effects on the EUV emission line ratios of C IV recently considered by Keenan et al. (1992) and found discrepant with observations of highly dynamics events. We use the same electron impact excitation rates adopted by Keenan et al. and two independent siphon flow models. The C IV line ratios predicted by our models do not differ appreciably between equilibrium and non-equilibrium conditions, and therefore indicate that the discrepancy found by Keenan et al. (1992) cannot be solved by steady flows. We discuss alternative solutions, also in view of forthcoming observations by CDS/SOHO.

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