Relative Coronal Abundances from Yohkoh SXT and SERTS Data

Details Relative Coronal Abundances from Yohkoh SXT and SERTS Data Relative Coronal Abundances from Yohkoh SXT and SERTS Data

Oct 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000spd....31.0224m&link_type=abstract

American Astronomical Society, SPD Meeting #31, #02.24; Bulletin of the American Astronomical Society, Vol. 32, p.1290

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Scientific paper

There is strong evidence documented in the literature to suggest that elemental abundances vary not only from the photosphere to the corona, but also from flare to flare and even active region to active region. In this study, coronal abundances for Active Region 7563 were obtained using a combination of broad-band filter data from Yohkoh SXT and simultaneous spectral line data from the SERTS rocket taken during its flight on 1993 August 17. We have used a forward-folding technique to determine the emission measure distribution of the active region plasma using the SERTS iron lines and the SXT filters. The response of these filters is dominated by the numerous iron lines of various ionization states in the X-ray portion of the spectrum. The SXT data are used primarily to constrain the high-temperature end of the emission measure distribution. The abundances of elements other than iron were then adjusted to achieve the best agreement with the original curve. Preliminary results suggest that lowering the abundance of silicon and raising the abundance of magnesium from the values found by Fludra & Schmelz (1999, A&A, 348, 286) will significantly improve the agreement with the original curve. This work is supported by NASA grant NAG5-7197.

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