Abstract
Context. 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 Ne iv–vi and O iii–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 $0.18\pm 0.05$, while in supergranule network regions is $0.16\pm 0.04$. A photospheric Ne/O ratio of $0.17\pm 0.05$ 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. Conclusions.
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