NASA NTRS · 19720015705
Long duration solar active regions
Abstract
Nimbus 3 and 4 observations of ultraviolet active regions of the sun have been investigated. It is not clear what is producing these UV-active regions, however, it could be changes in the overall intensity of the solar continuum near the region of the temperature minimum, or the solar flux variations that have been seen could be due to a continuous type of absorption like that associated with the ionization limits of elements such as aluminum, silicon, or magnesium.
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Heath, D.. 1972-01-01. Long duration solar active regions. https://ntrs.nasa.gov/citations/19720015705
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