Temperature and ionization balance dependence of O VII line ratios

Details Temperature and ionization balance dependence of O VII line ratios Temperature and ionization balance dependence of O VII line ratios

Nov 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...225.1065a&link_type=abstract

Astrophysical Journal, Part 1, vol. 225, Nov. 1, 1978, p. 1065-1068. Research supported by the Lockheed Independent Research Pr

Astronomy and Astrophysics

Astrophysics

34

Nonequilibrium Ionization, Oxygen Spectra, Plasma Diagnostics, Plasma Temperature, Solar Corona, Electron Energy, Forbidden Bands, Nonequilibrium Plasmas, Radiative Transfer, Recombination Reactions

Scientific paper

The forbidden-plus-intersystem to resonance line ratio (G) for the heliumlike ion O VII is calculated, taking into account cascades, blended satellite lines, and radiative plus dielectric recombination. It is noted that G is of particular use for investigating radiative-transfer effects and nonequilibrium ionization in the solar corona and that the calculations are applicable to a low-density optically thin Maxwellian plasma. The temperature dependence of G is considered for the case of a steady-state equilibrium plasma, and the effect of departures from ionization equilibrium on G is examined. It is found that G is quite insensitive to temperature over the range from 600,000 to 6 million K for a steady-state plasma, but that recombinations may be suppressed or dominant, depending on the relative abundance of O VIII, for a plasma in which the state of ionization is not in equilibrium with the electron temperature. This latter effect is shown to be capable of causing large variations in G that are dependent on electron temperature.

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