Detailed Evidence for Flare-to-Flare Variations of the Coronal Calcium Abundance

Details Detailed Evidence for Flare-to-Flare Variations of the Coronal Calcium Abundance Detailed Evidence for Flare-to-Flare Variations of the Coronal Calcium Abundance

Jul 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998apj...501..397s&link_type=abstract

Astrophysical Journal v.501, p.397

Astronomy and Astrophysics

Astronomy

17

Sun: Abundances, Sun: Corona, Sun: Flares, Sun: X-Rays, Gamma Rays

Scientific paper

The analysis of X-ray solar flare spectra obtained by the Bent Crystal Spectrometer on board the Solar Maximum Mission satellite is presented. The ratio of the Ca XIX resonance line intensity to the nearby continuum is used to measure the calcium abundance relative to hydrogen (ACa). A description of the spectroscopic method of determining the absolute calcium abundance is given. Possible instrumental and solar effects that might influence the abundance estimates are evaluated. Over 5000 spectra from more than 100 flares are analyzed. We find a flare-to-flare variation for ACa that is not correlated with flare size, H alpha importance, or with several other flare characteristics. For flares observed from two active regions, the observed value of ACa increases as a function of time. The average for all flares is = (5.77 +/- 1.41) x 10-6. A discussion of investigated correlations of derived ACa values with several flare characteristics is presented.

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