Other
Scientific paper
Sep 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...379..401p&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 379, Sept. 20, 1991, p. 401-405.
Other
16
Calcium, High Temperature Plasmas, Iron, Metallicity, Solar Flares, Solar X-Rays, Abundance, Metal Ions, Resonance Lines, Solar Corona, Solar Maximum Mission
Scientific paper
The iron-to-calcium abundance ratio during several flares observed by instruments on the P78-1 and Solar Maximum Mission spacecraft are determined using the intensity ratio of a dielectronic satellite line of Fe XXIV and the resonance line of Ca XIX. Values of A(Fe)/A(Ca) equal to 6.8 +/- 1.0 and 6.0 +/- 1.5 were derived from these data sets, respectively, the small difference being attributable to errors in the calculated instrument sensitivities. These values fall between two other determinations from X-ray spectra, but are less than the photospheric value. They are fairly constant from flare to flare, contrasting with other recent work which indicates strong flare-to-flare variations.
Feldman Uri
Phillips Kenneth J. H.
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