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New Aspects on Particle Acceleration in Solar Flares from RHESSI Observations View all abstracts by submitter

Kenneth Phillips   Submitted: 2008-06-09 07:26

The Ar XVII X-ray line group principally due to transitions 1s2 - 1s2l (l=s, p) near 4 Angstroms was observed in numerous flares by the RESIK bent crystal spectrometer aboard CORONAS-F between 2001 and 2003. The three line features include the Ar XVII w (resonance line), a blend of x and y (intercombination lines), and z (forbidden line), all of which are blended with Ar XVI dielectronic satellites. The ratio G, equal to [I(x)+I(y) + I(z)]/I(w), varies with electron temperature T mostly because of unresolved dielectronic satellites. With temperatures estimated from GOES X-ray emission, the observed G ratios agree fairly well with those calculated from CHIANTI and other data. With a two-component emission measure, better agreement is achieved. Some S XV and S XVI lines blend with the Ar lines, the effect of which occurs at temperatures >8 MK, allowing the S/Ar abundance ratio to be determined. This is found to agree with coronal values. A nonthermal contribution is indicated for some spectra in the repeating-pulse flare of 2003 February 6.

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

Publication Status: ApJ Letters (in press)
Last Modified: 2008-09-23 21:00
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