Letter to the Editor
The Ne/O abundance ratio in the quiet Sun
CCLRC Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire, OX11 0QX, UK e-mail: p.r.young@rl.ac.uk
Received:
6
October
2005
Accepted:
26
October
2005
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 
, while in supergranule network regions is 
. A photospheric Ne/O ratio of 
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.
© ESO, 2005