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The Solar Flare Chlorine Abundance from RESIK X-ray Spectra View all abstracts by submitter

Kenneth Phillips   Submitted: 2011-06-08 03:15

The abundance of chlorine is determined from X-ray spectra obtained with theRESIK instrument on {em CORONAS-F} during solar flares between 2002 and 2003.Using weak lines of He-like Cl, ion{Cl}{16}, between 4.44 and 4.50 AA, andwith temperatures and emission measures from {em GOES} on an isothermalassumption, we obtained A({ m Cl}) = 5.75 pm 0.26 on a scale A({ m H}) =12. The uncertainty reflects an approximately factor 2 scatter in measuredline fluxes. Nevertheless our value represents what is probably the best solardetermination yet obtained. It is higher by factors of 1.8 and 2.7 than Clabundance estimates from an infrared sunspot spectrum and nearby ion{H}{2}regions. The constancy of the RESIK abundance values over a large range offlares ({em GOES} class from below C1 to X1) argues for any fractionation thatmay be present in the low solar atmosphere to be independent of the degree ofsolar activity.

Authors: B. Sylwester, K. J. H. Phillips, J. Sylwester, V. D. Kuznetsov
Projects: CORONAS-F/SPIRIT

Publication Status: Accepted by Astrophysical Journal
Last Modified: 2011-06-08 07:48
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