Other
Scientific paper
Apr 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...133..239a&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 133, no. 2, April 1984, p. 239-246. Research supported by the Consiglio Nazion
Other
10
Abundance, Calcium, Ion Production Rates, Solar Flares, Solar Spectra, Solar X-Rays, Argon, Ion Density (Concentration), Ion Recombination, Isothermal Processes
Scientific paper
Spectra of calcium from solar flares are used in an attempt to derive an ionization balance for Ca XVIII/Ca XIX. The isothermal assumption inherent in this derivation is shown not to introduce errors, by modelling a number of hypothetical nonisothermal plasmas. The unresolved blend of calcium and argon lines prevents a definitive determination of the results, owing to uncertainties in the ratio of abundances of these elements. The resulting ionization balance curves are presented as a function of the solar argon/calcium abundance ratio. The theoretical ionization balance of Doyle and Raymond is consistent with the data. To within the expected accuracy of the atomic theories, there is no reason to assume that the flare plasma is other than close to steady-state ionization balance.
Antonucci Ester
Doyle Gerry J.
Dubau Jacques
Faucher P.
Gabriel Alan H.
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