Other
Scientific paper
Apr 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...389l..37r&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 389, April 10, 1992, p. L37-L40. Research supported by Smithsonia
Other
7
Electron Recombination, Solar Magnetic Field, Stark Effect, Stellar Coronas, Electric Field Strength, Emission Spectra, Extreme Ultraviolet Radiation, Ion Production Rates, Late Stars, Line Spectra
Scientific paper
Dielectronic recombination dominates the recombination rates of most ions in coronal plasmas at their temperatures of peak concentration. Because dielectronic recombination goes by way of high nl doubly excited levels, it is susceptible to collisional excitation and ionization, leading to a decreased rate. On the other hand, theoretical studies show that Stark mixing of the nl levels by a modest electric field enhances the dielectronic recombination rate severalfold. The ionization balance is computed here as as function of density, and it is found that the new results require increased emission measures to match the C IV emission line intensities observed in the sun and in late-type stars. They also make it more difficult to interpret the overall EUV emission line spectrum of the sun.
Kohl John L.
Raymond John C.
Reisenfeld Daniel Brett
Young Albert Raymond
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