The Solar Flare Chlorine Abundance from RESIK X-ray Spectra

Details The Solar Flare Chlorine Abundance from RESIK X-ray Spectra The Solar Flare Chlorine Abundance from RESIK X-ray Spectra

2011-06-07

arxiv.org/abs/1106.1387v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

13 pages, 3 colour figures. To be published, Astrophysical Journal

Scientific paper

The abundance of chlorine is determined from X-ray spectra obtained with the RESIK 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, and with temperatures and emission measures from {\em GOES} on an isothermal assumption, we obtained $A({\rm Cl}) = 5.75 \pm 0.26$ on a scale $A({\rm H}) = 12$. The uncertainty reflects an approximately factor 2 scatter in measured line fluxes. Nevertheless our value represents what is probably the best solar determination yet obtained. It is higher by factors of 1.8 and 2.7 than Cl abundance estimates from an infrared sunspot spectrum and nearby \ion{H}{2} regions. The constancy of the RESIK abundance values over a large range of flares ({\em GOES} class from below C1 to X1) argues for any fractionation that may be present in the low solar atmosphere to be independent of the degree of solar activity.

Affiliated with

Also associated with

No associations

Rating

The Solar Flare Chlorine Abundance from RESIK X-ray Spectra does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with The Solar Flare Chlorine Abundance from RESIK X-ray Spectra, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Solar Flare Chlorine Abundance from RESIK X-ray Spectra will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-27176