Analysis of extreme-ultraviolet spectroheliograms of solar prominences |
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| Authors: | Mitsuo Kanno George L Withbroe Robert W Noyes |
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| Institution: | (1) Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, 02138 Cambridge, MA, U.S.A.;(2) Present address: Hida Observatory, University of Kyoto, Kamitakara-mura, 506-13 Gifu-ken, Japan |
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| Abstract: | The optical depth at the head of the Lyman continuum, 
H, is determined at a number of positions in three hedgerow prominences using spectroheliograms (5 × 5 resolution) of C III 977, LC 896, and O IV 554 observed with the Harvard experiment on Skylab. At heights greater than 10 above the limb the maximum value of
H is 30 to 50, which occurs at the central part of the prominences. For one of the prominences the determination of
H is found to be consistent with data from spectroheliograms of Mg X 625. The degree of ionization of hydrogen is estimated from the intensity of LC 896 at
H  1. In the central part of a model prominence N
P/N
HI 1.9 for a reasonable range of the electron densities, where N
P and N
HI are the proton density and the neutral hydrogen density, respectively. |
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| Keywords: | |
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