The eruptive-spray event of 1974 January 17 observed from Skylab was an energetic limb event in which the expansion of a prominence arch with velocities of the order of 400 km s-1 was accompanied by heating to coronal temperatures. The authors have studied the prominence images photographed in the 300 - 630 Å wavelength range by the NRL spectroheliograph on Skylab. From the spectrum they have derived thermal properties for the brightest portion of the nearly straightened leg of the arch. Wavelengths, identifications, and intensities are presented for approximately 90 emission lines formed at temperatures between 105K and 106K. The emission measure plot is similar to those observed for the quiet Sun. From this plot the authors derive a neon to magnesium abundance ratio of 2.2 and an oxygen to neon ratio of 8.
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Widing et al. (1986) studied this question.