Astronomy and Astrophysics – Astronomy
Scientific paper
May 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...222..379r&link_type=abstract
Astrophysical Journal, Part 1, vol. 222, May 15, 1978, p. 379-383.
Astronomy and Astrophysics
Astronomy
35
Carbon Stars, Nonequilibrium Plasmas, Plasma Diagnostics, Solar Spectra, Stellar Atmospheres, Ultraviolet Astronomy, Astronomical Models, Beryllium, Late Stars, Metastable State, Nonequilibrium Ionization, Plasma Density, Radiative Recombination, Solar Corona, Solar Flares, Temperature Gradients, Transition Flow, Ultraviolet Spectra
Scientific paper
Mass flow through a temperature gradient can produce substantial departures of the ionization states from their equilibrium values and can change the character of line emission. The effect of such flows on extreme ultraviolet intensities in the solar atmosphere is evaluated for the beryllium-sequence ion C III, which is an easily observed and powerful diagnostic of electron density in a collisionally dominated plasma. A downflow of material in a transition region can lead to an underestimate of the electron density; outflow of material, as in a stellar or solar wind passing from chromospheric to coronal temperatures, yields a reliable density diagnostic. Ambiguities in the analysis of ultraviolet emission lines can be circumvented by measurement of several transitions.
Dupree Andrea K.
Raymond John C.
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