...The cloud-like prominences consistmainly of hydrogen, with helium and calcium, while many metals arepresent in the eruptive discharges...
Robert Stawell Ball 「The Story of the Heavens」
...It has been noticed that the eruptive prominencesare mostly found in those portions of the sun where spots usuallyappear, namely, in the regions near the solar equator...
Cecil G. Dolmage 「Astronomy of To-day」
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