Filaments
From Glossary of Meteorology
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filament
Dark, sinuous ribbon observed on the solar disk.
Filaments consist of higher density, and lower temperature material supported by solar magnetic fields that absorb the relatively intense disk emission (for example, as seen in Hα emission of neutral hydrogen). As these features rotate across the sun's limb they appear as quiescent prominences and are seen in elevation above the edge of the sun.
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