Abundance of Fe relative to H at 1.5 solar radii |
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Authors: | M P Nakada R D Chapman W M Neupert R J Thomas |
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Institution: | 1. Laboratory for Solar Physics and Astrophysics, NASA-Goddard Space Flight Center, 20771, Greenbelt, Md., U.S.A.
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Abstract: | The abundance of Fe relative to H is obtained by using resonantly scattered intensities of λ 284 of Fe XV that were measured with OSO-7 and resonantly scattered intensities of Lα of H I that were obtained by Gabriel (1971). Because of possible differences in electron densities along lines of sight for these non-simultaneous measurements and in relative calibrations, results are rather uncertain but still indicate that the average Fe abundance relative to H in the corona appears to be at least as large as a recent photospheric abundance. Some limitations in using this method for obtaining abundances are examined for future experiments with simultaneous measurements and well calibrated detectors. |
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