A solar spectroscopic absolute abundance of argon from RESIK

Abstract

Observations of He-like and H-like Ar (Ar XVII and Ar XVIII) lines at 3.949 Angstroms and 3.733 Angstroms respectively with the RESIK X-ray spectrometer on the CORONAS-F spacecraft, together with temperatures and emission measures from the two channels of GOES, have been analyzed to obtain the abundance of Ar in flare plasmas in the solar corona. The line fluxes per unit emission measure show a temperature dependence like that predicted from theory, and lead to spectroscopically determined values for the absolute Ar abundance, A(Ar) = 6.44 pm 0.07 (Ar XVII) and 6.49 pm 0.16 (Ar XVIII) which are in agreement to within uncertainties. The weighted mean is 6.45 pm 0.06, which is between two recent compilations of the solar Ar abundance and suggest that the photospheric and coronal abundances of Ar are very similar.

4 figures

References in corpus (7)

• The chemical composition of the Sun
• The Solar Argon Abundance
• Soft X-ray coronal spectra at low activity levels observed by RESIK
• Argon Abundances in the Solar Neighborhood: Non-LTE Analysis of Orion Association B-type Stars
• Highly Ionized Potassium Lines in Solar X-ray Spectra and the Abundance of Potassium
• The solar X-ray continuum measured by RESIK
• RESIK observations of He-like Ar X-ray line emission in solar flares

Cited by in corpus (13)

• The FIP and Inverse FIP Effects in Solar and Stellar Coronae
• Non-WKB Models of the FIP Effect: The Role of Slow Mode Waves
• Solar Flare Composition and Thermodynamics from RESIK X-ray Spectra
• Stellar Coronae, Solar Flares: a Detailed Comparison of sigma Gem, HR 1099, and the Sun in High-resolution X-rays
• The Solar Flare Iron Abundance
• The Solar Flare Chlorine Abundance from RESIK X-ray Spectra
• RESIK Solar X-ray flare element abundances on a non-isothermal assumption
• The X-Ray Line Feature At 3.5 Kev In Galaxy Cluster Spectra
• Coronal Elemental Abundance: New Results from Soft X-ray Spectroscopy of the Sun
• The Solar Flare Sulphur Abundance from RESIK Observations
• Highly ionized Calcium and Argon X-ray spectra from a large solar flare
• A Unique Resource for Solar Flare Diagnostic Studies: the SMM Bent Crystal Spectrometer
• On the Application of Differential Evolution to the Analysis of X-Ray Spectra