: Astronomie: filament

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filament

A filament is a strand of relatively cool gas suspended by magnetic fields over the solar photosphere so that it appears as a dark line over the Sun's disk. A filament on the limb of the Sun seen in emission against the dark sky is called a prominence. Filaments often mark areas of magnetic shearing and can be seen only in the centers of strong spectral lines, such as H-alpha or the H and K lines of calcium. (Encyclopedia of Science, by David Darling, https://www.daviddarling.info/encyclopedia/F/filament.html)

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