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By P. R. Young


Aims. To determine the neon-to-oxygen abundance in the quiet Sun, a proxy for the photospheric abundance ratio. Methods. An emission measure method applied to extreme ultraviolet emission lines of Neiv–vi and Oiii–v ions observed by the Coronal Diagnostic Spectrometer on the SOHO satellite. Results. The average Ne/O abundance ratio in supergranule cell centre regions is 0.18 ± 0.05, while in supergranule network regions is 0.16 ± 0.04. A photospheric Ne/O ratio of 0.17 ± 0.05 is suggested, in good agreement with the most recent compilation of solar photospheric abundances, but discrepant with a recent Ne/O ratio derived from stellar X-ray spectra and revised neon abundances suggested from solar interior models

Year: 2005
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