Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...392..715w&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 392, no. 2, June 20, 1992, p. 715-721.
Astronomy and Astrophysics
Astrophysics
70
Skylab Program, Solar Corona, Solar Magnetic Field, Spectroheliographs, Stellar Composition, Metallicity, Solar System, Solar Wind
Scientific paper
The paper determines element abundances in a coronal polar plume previously observed to have a low Ne/Mg abundance ratio associated with an open magnetic field. This study is based on images of the plume in Ne VI, VII, Mg VI-VIII, Na VIII, and Ca IX, X photographed between 300 and 600 A by the NRL spectroheliograph on Skylab. The density variation with height derived from MG VIII 436.7 A is satisfactorily fitted with a temperature of 843,000 K in hydrostatic equilibrium, close to the temperature expected in ionization equilibrium. The electron density derived from the MG VIII doublet ratio is 1 x 10 exp 9/cu cm. Element abundances relative to magnesium at several altitudes are derived by combining plots of the ion differential emission measures. The relative abundances of Na, Mg, and Ca in the plume are found to be the same (within a factor of 2) as those in the photosphere, whereas the abundance of neon relative to magnesium is only 1/10 of this ratio in the photosphere.
Feldman Uri
Widing Kenneth G.
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